Renewable Energy Log

April 2007
27th - 12v Items

March 2007
24th - New Monitor Box

January 2007
30th - 90Ah SLA Battery
26th - New Charge Controller
10th - 18w Panel Smash

December 2006
23rd - RE Radio Shack
4th - RE Laptop
2nd - 10mm LED Torch

November 2006
21st - Panel Stand

October 2006
16th - More Portable Ideas
10th - More Portable Ideas
8th - Portable Ideas
2nd - 60w Array

September 2006
20th - 18W eBay Panel
20th - Solar Monitor Box
17th - CCFL Lights
17th - 17Ah Battery Datasheet
5th - SLA Batteries

August 2006
6th - 6W Folding Panel

Copyright © 2006-2007
Andrew Whyman

10mm White LED Torch:

I recently got worried about the amount of power the CCFL I use as a desk light was using. 0.5A for 6-8hours per night means Im using about 4Ah of power. For a 17.2Ah battery thats pushing the safe discharge limit of 25% which I like to stick to if possible.

I decided an LED light would be a better option since the CCFL gives out more than enough light. A little less wouldnt hurt. I got 50 10mm white LED's from eBay for 10, including some resistors for 12v use.

I got to work as soon as they arrived and came up with the light you see below. Unfortunately it didn't come out as planned. The light it emitted was confined to a spot, it didnt spread out. I expected it might spread out a little more than it did because I have another LED light that does, but that uses 3mm LED's as appose to the 10mm LED's this one uses.

This was a small setback. However after testing I decided it wasnt so bad afterall. It made the perfect LED torch. The range was about 5-10m before the light fades off too much, and the current draw was only 180mA.

Number of LED's: 21
LED size: 10mm
Luminous Intensity: 130,000mcd
Total current draw: 180mA @ 12v
Total cost: approx 5