For a while I have been looking to instal LED lighting in my workshop, but every time I go to the DIY center, I look at the price tags and keep on walking. About a month ago, the Electronics Goldmine had a sale on 12V/10W/900 Lumen LEDs. $3 each! 900 lumens is equivalent to a 60 watt incandescent bulb. The datasheet I am using is here.
Once I received the LEDs, a quick test with my powersupply demonstrated them working VERY well, but running them from my bench supply would not do in the long term. A solution had to be found in my parts bin…
- 19v 1.5A Notebook power supply
- 2x 10W LEDs
- Pentium II heatsink with fan
- 12v regulator LM7812
- rack mounting hardware
The two LEDs are connected in series, to allow a 19v power supply to be used. The LEDs are mounted on the Pentium II heatsink and the van is powered via the 12v regulator, also mounted to the heatsink. I borrowed my daughter’s pink(!) hot glue gun to keep the cables in place.
Total cost is less than $10. Sure beats the DIY store price! Is it beautiful? Nope… but who cares, my workbench is now superbright! Need another one for the other end of the workbench. ## come here little powersupply! be a good boy! ##
An FYI on the heatsink: These high power LEDs need to be kept cool to ensure their longevity. The Pentium II heatsink might be sufficient without the fan, but why take the risk… it’s already there!