Electronics > Repair
Snap-on LED Work Light Malfunction
Smoky:
Well, I removed one of the current sense resistors, the .68 Ohm one. The intensity of work light seems more comfortable now than before. Not blazing bright anymore but surely not 50% or less. It sure seems like 70% or so, but I'm still partially blinded from the last test ;D
So what is the reasoning behind two sense resistors anyway? Install one first to get the lamp up and running and then a second to fine tune the brightness in front of a light meter :-//
Thanks for the tip FloobyDust!
tunk:
The two resistors in parallel are 0.22 Ohm,
so the output has been reduced by one third.
The reason for using two is finetuning.
floobydust:
Removing just the 0.68Ω gives 67% of the original LED current. Something I would do if the board/LED's runs too hot. They seem to tweak the LED current to just below meltdown/achieve warranty period which is fine- but a fixture doesn't last.
I notice if you drop LED current to 2/3 you don't get 2/3 light output - many LED's end up more efficient at a bit less than max. current and produce more light.
So you might not have lost 1/3.
That work light was rated 1,600 lumens/30W in and now is rated 2,000 lumens/25W which seems like a leap.
Xena E:
--- Quote from: Smoky on October 01, 2024, 03:14:03 am ---
I plugged the work light in and flicked the switch, and just like that, wham-o, I'm blind, I can't see!
--- End quote ---
That's a really super result! It's good when a well told story has a happy ending. :-+
--- Quote from: Smoky on October 01, 2024, 03:14:03 am ---
I find messing with old lead-free solder a pain. I use the lead+silver type and it's an absolute pleasure to use.
--- End quote ---
It would be great if you could take a picture of the label of this lead/silver solder of which you speak, it would be something that I personally would like to try if it's such nice material to use.
Thanks in advance.
X
Smoky:
The problem with things I fix, especially when helped with tips and tricks that makes them better, is that I don't want to use them anymore, I just like looking at 'em ;D
Ok, I'll use the work lights again but just not in crawlspaces anymore, maybe in an attic:
Not long ago I bought a tray of 50 LEDs and I wasn't sure if I'd ever use them but the tray was under $5, how can you go wrong? Bridgelux BXRC-27G1000-B-73-SE. They're about 1-3/8" in diameter and run on a off-voltage (35v?) and wires just push into built-in sockets. But now I'm thinking they could possibly be mounted in work lights like these when their LED boards go bad :-//
Xena E, the silver solder is made by Kester, 24-7150-0018. I bought several rolls of these at the time because they were being dumped due to their old date codes. All I can say about this solder is that it just gets better with age ;D
Thanks for the help :-+
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