2014年8月31日星期日

How to Build a Grow Box With LED Lighting

How to Build a Grow Box With LED Lighting

Growing your own plants at home can be even more productive when you get them to grow inside in an organic grow box. With the advent of bright light emitting diodes, or LEDs, you can add intense light close to your seedlings without burning the plants. The construction of a grow box basically involves using a structure large enough to house your plants with extra space for air ventilation.

Instructions
1
Line a large box or plastic storage container with sheets of aluminum foil. Use a few beads of craft glue along the inside of the box to hold the foil in place. The foil will reflect more of the light around the plants than a box without foil.

2
Place a shallow tray in the bottom of the box to hold drainage water. This makes it easier to water the plants and keeps the bottom of the grow box clean.



3.Set your soil-free filled plant pots onto the tray, while leaving enough space between the plants for good air circulation.

4
Attach two rows of high-intensity white LED light strips to the bottom of the cover of the grow box. Some strips come with pre-attached adhesive while others require a few screws to keep them in place. Drill a hole through the side edge of the cover with a drill. To keep the hole small, drill the hole as large as the width of the cord and slice from the hole to the edge of the cover. Pry open the slit with a utility knife to slide your plug through.

5
Place the cover over the organic grow box. Plug in the LED lights to test. Remove the cover. Plant your seeds, add water and nutrients as needed per plant. Replace the cover on the box, turn on the LED lights and wait for the plants to sprout.



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    Does the Motorola Backflip Have a LED Light for Notifications?

    Does the Motorola Backflip Have a LED Light for Notifications?

    Many cellphone users rely on LED lights as a notification for messages received. LED notifications are useful for times when you have the phone's sound and vibrations settings turned off or if you don't hear the tone that plays when you receive a message. The Motorola Backflip has an LED notification feature, but it is not available out of the box.

    About
    The Motorola Backflip has one LED light around the battery-charging port on the right side of the phone. The light blinks when the battery is running low and remains lit when you charge the battery. When first released, the Motorola Backflip LED had no other function beyond a battery-charging indicator. The LED was not functional for message notifications; you needed to turn on the phone screen to check for received messages. The Android 2.1 update for the Motorola Backflip included a setting that, when enabled, gives the battery-charging LED message-notification capabilities.

    Download Update
    Visit the Motorola website and download the Android 2.1 update to your computer. Connect your phone to the computer using the supplied USB data cable and tap “USB Drive” when the message “USB Connected” appears on the screen. Open “My Computer” on your computer. You’ll see phone icon labeled “Removable Disk.” Click and drag the downloaded file onto the phone. Once the transfer is complete, disconnect the phone from your computer.



    Updating Phone
    Before performing the Android 2.1 update, make sure the phone is fully charged. You may also want to back up all of your data in case a problem occurs during the update and your data are deleted. Press the “Home” button below the screen to open the home screen. Push the “Menu” button, tap “Settings,” “About Phone” and “System Update.” The Backflip searches your microSD card for the update. Tap “Copy” when the option appears and then tap “Now” when the “Install Update” message appears. The update process can take more than15 minutes, after which you can use the phone as normal.

    Settings
    Once the update is installed on your phone, you need to adjust the phone’s settings so that the LED turns on when you receive a message. To find the setting, go to the home screen on your phone and press the “Menu” button. Tap “Settings” and then “Sound & Display” to show a list of settings you can adjust. On the list is a “Notification LED” option. Tap the check box next to the option to place a check mark in the box, indicating it is enabled.

    Considerations
    You can turn off the message notification LED by opening the “Sound & Display” menu and tapping the check box to remove the check mark. Though the LED won’t blink anymore when you receive messages, it still turns on when the phone battery is low or when you’re charging the phone. You should note that turning on the notification LED option uses more battery power than when it’s off, though you shouldn’t see a significant drop in battery life.



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    How to Focus a Light-Emitting Diode

    How to Focus a Light-Emitting Diode

    Light-emitting diodes have graduated well beyond their initial roles as panel indicator lights. Now LEDs are used for applications such as flashlights, automobile headlights and architectural lighting. Although LEDs are readily available, they're not very useful unless the light they generate can be routed from where it is to where it needs to be.



    For use as laboratory sources, it's often valuable to collimate the light from an LED, to turn it into a "light beam." The calculations are more involved when using high-power LEDs for specialty or general lighting.

    Instructions
    Using an LED as a Collimated Source

    1
    Identify the illumination pattern for the LED. Usually the manufacturer will, at a minimum, provide the divergence angles in the x and y directions.

    As an example, assume the LED has a divergence of 38 degrees in x and 47 degrees in y.

    2
    Determine the appropriate focal lengths to get the desired beam size.

    The focal length is given by the formula f = D/(2*tan(alpha/2)), where D is the desired beam diameter and alpha is the full beam divergence in the direction in question.

    For this example, take a desired beam diameter of 25 mm. Then,

    fx = 25/(2*tan(38/2) = 36 mm

    fy = 25/(2*tan(47/2) = 29 mm



    3.Place the shorter focal length cylindrical lens at its own focal length away from the LED.

    In the example, a cylindrical lens with a focal length of 29 mm will be placed 29 mm away from the LED, oriented so that it focuses the y direction.

    4
    Mark an index card with the desired beam diameter, and check to see that the beam stays at that size over the required distance. Adjust the position of the lens to keep the beam in the desired diameter.

    In the example, the index card will have a 25 mm diameter circle, and the lens is adjusted to keep the vertical dimension of the beam as nearly as possible within the circle.

    5
    Place the longer focal length lens its own focal length away from the LED.

    For the example, a cylindrical lens with a focal length of 36 mm is placed 36 mm away from the LED, oriented so that it focuses the x direction.

    6
    Adjust the second lens position to optimize the collimation. Use the index card as a guide.

    To complete the example, adjust the 36 mm focal length lens to keep the width of the beam as nearly as possible within the circle.

    7
    Select an appropriate anamorphic prism pair. An alternative to two cylindrical lenses is to place an anamorphic prism pair close to the LED, which circularizes the beam, equalizing the divergence in the x and y directions. A single lens with the focal length collimates the beam.

    Using LEDs for Illumination
    8
    Find the output pattern for the LED. Whether the white color is created by superimposing light from LED chips of different colors, or by emission from a phosphor-coated ultraviolet LED, the emission pattern is the starting point. Manufacturer's data sheets provide this information.

    9
    Define the desired illumination pattern. A desktop task light and a streetlight have quite different target illumination patterns.

    10
    Model the system in an optical design program. These programs accept manufacturer's data files as input, then propagate the light through a user-defined optical system, and calculate the final illumination pattern.

    11
    Use the internal optimization routine of the optical design program to tweak the optical surfaces and adjust the output illumination pattern.



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    How to Decorate a Christmas Tree With LED Lights

    How to Decorate a Christmas Tree With LED Lights

    Decorating a Christmas tree with LED lights has several advantages. LED lights give off no heat, so they are safer for real Christmas trees, rugs, walls and hardwood floors. LED lights draw less energy, which makes them more cost effective to use. You can also program some models of LED lights to change colors, flash and execute chase patterns. With the flexibility of LED Christmas lights also comes the need to plan out your scheme.

    Instructions
    1
    Look at Christmas light displays you come across daily to see what sizes and shapes of LED Christmas lights you want to put on your tree. LED lights come in the same sizes as standard Christmas lights, notes Christmas Light Source. Because LED lights give off no heat, some manufacturers are able to offer decorative lights in different shapes such and designs made from plastic light covers. According to Holiday LEDs, your best option for light spacing on your LED light strings is 4 or 6 inches.

    2
    Draw a diagram of sample light patterns so you can decide which ones you want to use for the lights. If you will be using programmable lights done in a specific chase pattern, then you will want the lights on and running when you put them on the tree so that you get the correct pattern when you are done. Try to use different light hanging patterns other than wrapping the lights around the tree. For example, try draping the lights on the tree starting at the top and looping down to the bottom.



    3.Start placing of the LED lights on the Christmas tree at the bottom. Use an extension cord to reach the tree to prevent lights from hanging off the bottom of the tree. Lay the lights on the top of the branches. Wrapping them around the branches can make the lights look bunched up and disorganized.

    4
    Lay the lights 2 to 3 inches inside the tree on each branch. Because LED lights give off no heat, it is safe to lay them inside the tree slightly to hide the lights and the wires.

    5
    Check all sides of the tree to make sure the LED lights are lying on the branches uniformly.


    Tips & Warnings
    The LED lights give off no heat, so you can place them on real tree branches and glass ornaments.

    Ensure tinsel doesn't become tangled up in the lights, and keep the hook ends on ornaments away from the lights to reduce the risk of accidentally piercing the wires.



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    How to Connect Power LED to a Motherboard



    The power light emitting diode is a small light diode installed on the front panel of the computer case. If connected to the motherboard, the power LED lights up steady green when the computer is turned on, and starts to blink or lights in yellow when the computer goes into sleep mode. This LED is not important for the computer's functionality, but it allows you to easily identify if your machine is in sleep mode.

    By an eHow Contributor
    X
    Contributing Writer
    This article was created by a professional writer and edited by experienced copy editors, both qualified members of the Demand Media Studios community. All articles go through an editorial process that includes subject matter guidelines, plagiarism review, fact-checking, and other steps in an effort to provide reliable information.


    Found This Helpful
    The power light emitting diode is a small light diode installed on the front panel of the computer case. If connected to the motherboard, the power LED lights up steady green when the computer is turned on, and starts to blink or lights in yellow when the computer goes into sleep mode. This LED is not important for the computer's functionality, but it allows you to easily identify if your machine is in sleep mode. Have a question? Get an answer from online tech support now!


    Instructions

    1
    Switch off the computer and disconnect the power cord on the back panel.

    2
    Open the computer case by removing the side panel. Then lay the computer on its side. Note that the motherboard is attached to the opposite side panel with screws.

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    3
    Look for the system panel connector cluster that is in the bottom right corner of the motherboard. This cluster includes at least five different connectors, including a power switch, reset, a case's speaker, power and hard drive LEDs.

    4
    Consult the motherboard's manual and find out which pins in the cluster correspond to the power LED connector. The manual will have a scheme on which the polarity ("+" and "-") of the connection is marked.

    5
    Locate a computer case cable that goes from the power LED. This cable has a connector on the end that would fit into the pins on the motherboard.

    6
    Touch the metal surface of a large object to discharge static electricity before doing any work with electronic parts such as the motherboard. For example, touch an unpainted metal part of the computer case.

    7
    Insert the connector of the power LED cable into the corresponding pins (see Step 4) on the motherboard using a gentle force.

    8
    Close the computer case and power up your machine.


    Tips & Warnings

    Static electricity can severely damage the motherboard and other computer components. This damage is not covered by the manufacturer's warranty.




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    How to Synchronize LED Lights With iPod Music

    How to Synchronize LED Lights With iPod Music

    Lights that blink on and off in time with music are often used by dance clubs to excite the crowd. To create your own "light show" with the music coming from an iPod, use a music sync device. There are a number of these devices available from computer and electronics stores, and even hobby shops. These devices all work in a similar manner to control the illumination of lights in time with audio. Those that include LED lights as part of their makeup eliminate the need for any assembly work whatsoever. An audio speaker, however, will also be needed (e.g., an iPod music dock) in order for the iPod's music to be heard.

    Instructions
    1
    Place the music sync device on a table. Stretch out the LED light modules attached to the music sync device so that they form an irregular pattern on the table. Plug the music sync device's power cord into a wall socket for power. Press the music sync device's power button to turn it on and supply power to the LED lights.

    2
    Place the speaker dock on the table. Plug its power cord into a wall socket for power. Insert the iPod into the speaker dock's iPod connector.



    Aim the front of the music sync device, which contains the built-in microphone, toward the front of the speaker dock.

    4
    Press the power button on the speaker dock to turn it on. Press the "Menu" button on the iPod to bring up the menu. Select "Music" from the menu. Scroll down the list of choices on the screen and select a playlist. Press the "Play" button to begin playing songs from the playlist.

    5
    Press the "Volume +" button on the speaker dock to increase the audio volume. Continue increasing the audio volume until the LED lights of the music sync device begin to blink.

    6
    Adjust the fine-tuning knob on the music sync device to control the speed and intensity of the light's blinking. Turn the room lights off and enjoy the light show as the music plays.



    Tips & Warnings
    Music sync devices that rely on being plugged in to independent LED lights must not exceed the rating for the AC power of the device.



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    How to Update an Azbox FTA Receiver

    How to Update an Azbox FTA Receiver
    Azbox FTA receivers act as a part of your satellite system to acquire free-to-air or FTA programming. FTA receivers, including Azbox models, require updates to the software to remain in touch with the various satellites. Unlike other FTA technology, the built-in Ethernet port allows Azbox receivers to quickly scan for updates and install them directly to the receiver. Connect your receiver to your router or modem with an Ethernet cable to discover new updates and transfer them immediately to your system
    1
    Plug one end of the Ethernet cable into the "Ethernet" port on the rear of the receiver and insert the other end to an Ethernet port on your router or modem.
    2
    Turn on the Azbox receiver and press the "Home" button on the remote control. Use the arrow keys on the remote to select the "Settings" option and press "OK."

    3
    Highlight the "Information" option and press "OK." Select the "Firmware Upgrade" entry and press "OK" to search for updates.
    4
    Highlight the newest update in the list and press "OK." The receiver will automatically download the update and install it to the receiver.

    How to Find If an LED Tail Light Meets Department of Transportation Standards

    How to Find If an LED Tail Light Meets Department of Transportation Standards

    One of the key difficulties in car modification and repair is ensuring that your car is "street legal"--that is, it complies with all the standards and regulations for cars implemented and enforced by the U.S. Department of Transportation. Even a non-standard tail light can mean that your car can be taken off the road. With careful examination, however, ensuring your LED tail light meets government standards is a simple process.

    Instructions
    1
    Go to an automotive parts store and examine the tail light you would like to install. The packaging will be clearly marked if the tail light is approved by the federal Department of Transportation. Also examine it for signs that it is a counterfeit part; such signs include misspellings on the packaging, bad grammar and incorrect contact information for the company. If you find signs of a counterfeit part, or no sign of DOT approval, assume it is not approved and investigate other brands until you find one that is DOT-approved and has no signs of counterfeiting.

    2
    Examine the specifications of the tail light and compare them to your state's specifications for tail lights. While it is likely the government and the state have very similar requirements, there may be subtle differences that may disqualify the light. If possible, ask to see a demonstration model of the part, or ask if there are cars at the shop with this tail light already installed so you can see it in action.

    3
    Install the tail light, and then test it to make sure it performs to both federal and state standards. Turn the wheel to the direction it is signaling in to see if it shuts off. Time the light to ensure it is not flashing too quickly, which may be a safety hazard for epileptic drivers. Ensure the light turns on and turns off smoothly with the use of the turn signal, and that it has been wired to the turn indicator on the dashboard. Look at the light at night and ensure it is bright enough to be seen but not bright enough to dazzle other drivers.



    Tips & Warnings
    Use only reputable auto parts dealers and installers. For local dealers, check sites like Yelp to find out more about their reputation and business. Local and national dealers will likely carry parts that meet state and federal standards.

    Log on to the website of the company you are considering buying a tail light from. The site should note the part is DOT approved.

    Counterfeit car parts are a major risk. If you have any suspicion that a part is counterfeit, do not install it.

    Never install a car part yourself unless you know exactly what you are doing. If you are uncomfortable or uncertain, have a professional install it for you.



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    How to Connect Power LED to a Motherboard

    How to Connect Power LED to a Motherboard

    The power light emitting diode is a small light diode installed on the front panel of the computer case. If connected to the motherboard, the power LED lights up steady green when the computer is turned on, and starts to blink or lights in yellow when the computer goes into sleep mode. This LED is not important for the computer's functionality, but it allows you to easily identify if your machine is in sleep mode.
    Instructions
    1
    Switch off the computer and disconnect the power cord on the back panel.

    2
    Open the computer case by removing the side panel. Then lay the computer on its side. Note that the motherboard is attached to the opposite side panel with screws.



    3.Look for the system panel connector cluster that is in the bottom right corner of the motherboard. This cluster includes at least five different connectors, including a power switch, reset, a case's speaker, power and hard drive LEDs.

    4
    Consult the motherboard's manual and find out which pins in the cluster correspond to the power LED connector. The manual will have a scheme on which the polarity ("+" and "-") of the connection is marked.

    5
    Locate a computer case cable that goes from the power LED. This cable has a connector on the end that would fit into the pins on the motherboard.

    6
    Touch the metal surface of a large object to discharge static electricity before doing any work with electronic parts such as the motherboard. For example, touch an unpainted metal part of the computer case.

    7
    Insert the connector of the power LED cable into the corresponding pins (see Step 4) on the motherboard using a gentle force.

    8
    Close the computer case and power up your machine.



    Tips & Warnings
    Static electricity can severely damage the motherboard and other computer components. This damage is not covered by the manufacturer's warranty.



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    How to Replace an LED Cat Eye Bike Light

    How to Replace an LED Cat Eye Bike Light

    Cat Eye LED bike lights are mounted on both the front and back of your bike so you can ride safely at night. These bike lights are easily replaceable should one of yours ever fail or should you just want a different model light. Learning how to replace a Cat Eye LED bike light can help you insure that your bike is equipped with everything it needs to keep you safe.

    Instructions
    1
    Remove the light from the bracket fastened to your bike by pressing the red button located on one of the sides of your light to release it. You should be able to pull it forward gently and hear it click out of place. Don't try to force it if you intend on keeping the bracket.

    2
    Unscrew the dial on the bracket strap fastened to your bike and remove the light. You'll want to take this with you to purchase a new light to insure that the new light will fit in your bracket. If you know the bracket model and number, then you can leave it on the bike.



    3.Purchase a Cat Eye LED light to fit the bracket you have on your bike. If you have an older model, you may have difficulty finding a light that fits, but ask the salesclerk if he can suggest a replacement.

    4
    Refasten your bracket around the front or back bars on your bike with the dial facing inward, looping it around the bar and back through the slot under the dial. Turn the dial clockwise to fasten. Slide your light into the bracket from the side opposite the dial until you hear a click that indicates it is locked in.



    Tips & Warnings
    Always read all instructions and safety warnings that accompany any new light you buy prior to installing the light onto the bike.



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    How to Mount an ISO to a Thumb Drive

    An ISO image is digital copy of a physical CD or DVD. It is often used to digitally distribute operating systems (mainly Linux) as well as used to backup other CDs or DVDs. If your computer does not contain a disc drive, you will need to mount the ISO to a flash thumb drive to access and use the data contained on the ISO file. This is accomplished using a virtual disc drive and some basic Windows commands. Instructions 1 Download and install a virtual disc image mounting utility. These utilities create a virtual disc drive, allowing you to mount the ISO file, as if it were a physical CD/DVD in a physical CD/DVD drive. Some applications that allow you to do this are MagicDisc, Daemon Tools and Virtual CloneDrive. 2 Launch the virtual disc drive application and open the ISO image to mount it. Be sure to note the drive letter associated with the virtual drive. 3.Insert the USB flash into the computer's USB slot. 4 Open the Command Prompt by typing "cmd" into the "Search" box (Vista and later) or opening the "Run" dialog from the "Start" menu and typing "cmd" and clicking "OK." 5 Type "xcopy D:\*.* /s /e /f F:\" and hit Enter. Replace "D" with the letter of the virtual disc drive. Replace "F" with the letter of the USB flash drive. Allow the process to complete. It may take a while depending on the size of the ISO image. Once complete, the ISO file will be mounted to the thumb drive. usb flash drive china cheap usb flash driveusb flash diskwholesale usb flash drivecheap usb flash driveusb flash drive factoryusb flash drive manufacturermanufacturer usb flash drive usb flash memoryusb flash memory for iphonechina usb drivepower bank wholesalesmart phone power bank wholesale

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