I also completed a build. Results were less than spectacular, since I have a severe transistor-heating problem. I could only run for very short times.
I used the 120V -to- 12V Radio Shack transformer recommended by Peanutbutter and a 3055 transistor, and a 3 W LED bulb, and the LED indicator recommended by Lidmotor. Lots of good ideas...
Over short times, I measured about 90-100 Lux (approx 8 Lumens) is all... with 10V in and 0.9 A. Obviously, I have not found that "sweet spot"... Roughly 1 Lm/W -- nothing to write home about.
I tried a small audio amplifier also: borrowed from a neighbor, a young man who is an electronics wizard IMO. This promptly blew out the LED indicator light.
I need to talk to him about this circuit...Back to the drawing board. Since its a holiday and family are coming, not much time for further experiments this Memorial Day weekend... (sigh; but great to have family times together!)



but at least are seemingly being wider stocked than just Lowes.
.
(PS -- I'm not claiming OU at this stage!!)
. On the light box, ya I'm waiting on the meter still from HK....supposedly mid June I think, Ugh!
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