Incandescent lights

Jon Elson elson at
Fri Feb 6 11:35:02 CST 2015

On 02/06/2015 10:15 AM, js at wrote:
> Very interesting -- how did you build a retrofit for a 48" 
> T12?
> - J.
OK, here's a bad picture of my first retrofit, 10 Cree 1W 
lamps and a home-made power
supply.  The fluorescent tube retrofits are made on strips 
of 2" wide PC board material.
I have some left over from an old project, so cut it into 2" 
strips 22" long.  I cut
little grooves in the copper to make 11 2 x 2" squares, and 
check with a meter that
they are isolated.  I then solder 10 Cree 
XPEBWT-01-0000-00CC2 LEDs across the
grooves.  Then, I solder a pair of these strips in series to 
make a 20 LED string.
I need to make a picture of this next time I'm in there, or 
make another unit
(which is on the to-do list).

I use an LED Supply LED25W-72-C0350 power supply from 
Digi-Key to power
it.  These units have been running in a flush drop-ceiling 
fixture for almost a year
now, and are still doing very well.  The 10-LED job has been 
running almost
2 years, now.

These things are NOT cheap, but I'm expecting to get better 
life than most
of the commercial units, which I think have crummy thermal 
design. I think
they work out well.


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