Hacked Gadgets Forum

June 23, 2006

Build an emergency LED Light

at 5:47 am. Filed under DIY Hacks, Electronic Hacks

UtahNature has a few interesting emergency light project uses a few white LEDs to create an inexpensive light.
Project 1
Project 2

“We will describe constructing an emergency light using 3 or 4 white LEDs fitted into a 1/2 or 3/4 inch PVC pipe coupling and mounted into a clamp-on miniture light housing. Since most radio shacks have a 13.8 VDC emergency supply, we will configure the light to use this power source.

We tried making an LED light array with 3 white LEDs, then 4 white LEDs, but when we wanted even more light, we used 15 white LEDs.”


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9 Responses to “Build an emergency LED Light”

  1. David Murray Says:

    Why did he put seperate resistors on each LED rather than doing them in series? Or at least
    have 3 or 4 LEDs in series and have little series groups. That would be much more energy efficient.

  2. Alan Parekh Says:

    Hi David,

    Only thing I can think would be for survivability of the circuit given a failure. Although we all know how reliable LEDs are and with a life of 100,000 hours this might not be the biggest concern.

  3. Aaron Says:

    How is this better than a regular flashlight?

  4. Alan Parekh Says:

    Might not be better, but it would be more fun to build rather than buy 🙂

  5. Robin Tuck Says:

    We did this in March 2001, back when white LEDs were fairly new and expensive. We used current limiting resistors on each LED to make sure we didn’t burn any of them out. Of course, we quickly learned that LEDs are relatively hardy and could be wired in series without harming them.

    The price decrease for LEDs and LED flashlights in the past 5 years has been amazing although not entirely unexpected.

    This is truly a case where the follies of the past come back and bite you.

  6. Chetan Says:

    Why cant the ckt be made more efficient by a charge pump ckt to drive the led chains off a low 4.5v battery that a flashlight has? can someone give a ckt idea for this?
    I belive that the battery life will be much more that this. also the LEDs will glow more brighter.

  7. Collin Says:

    Alan pls can u reupload the construction of the emergency light ?
    i would like to do this for my high school project

  8. Alan Parekh Says:

    Hi Colin,

    Looks like the original post has either been removed or has been moved. It was not done my be so I have no control over that.

    If you do find it at a new location please let me know so I can update the links.

  9. Alan Parekh Says:

    Hi Colin,

    I just got an email from the creator of the project. The links have been fixed.

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