Fluorescent lights (Was: Full immersion emulation)

Jon Elson elson at pico-systems.com
Mon Mar 6 23:01:33 CST 2017

On 03/06/2017 08:57 PM, Eric Christopherson via cctalk wrote:
> I assume the kind of LEDs under discussion doesn't have the problem of
> overheating that some LEDs have when placed in enclosures without heat
> sinks, right?
The 48" LED fluorescent retrofits have a lot of surface 
area, so they probably do OK.  The retrofits I made are
electrically isolated from the line, and have 88 square 
inches of copper PC board material to act as a heat sink.
They still run quite warm, although when on, the optical 
output of these things is stronger than full sunlight, so 
they appear to be REALLY warm on the skin, so that fools 
you.  You have to test the temperature just one second after 
they are turned off to get a better idea of the real 

I'm running about 19 W total into 20 1W LEDs, replacing TWO 
48" tubes.  Previous input to a 2-lamp ancient ballast was 
103 W, the LED supply draws 21 W, as measured with a real 
power meter.


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