Recent content by matt832

fenix-store
  1. M

    driving LEDs, different drivers different light quality?

    I did drop out 1 led from each set, light output went up as expected. Still runs cool, so that is good. For the heck of it I tossed together another supply to replace the cheap China made driver. It's running with similar specs to the others I built, mainly 200 ma current. The lights now run...
  2. M

    driving LEDs, different drivers different light quality?

    ok, will try that. Should I redesign the soppy to get more current? what are the benefits of doing that?
  3. M

    driving LEDs, different drivers different light quality?

    OK, did some measurements. In is 33.5v ground to LM317 out 30.6v across LM317 2.39v negligible AC at LM317 I'm using 10 LEDS rated at 3.6v be bank so it appears I'm under voltage a bit. They are running cool, but I would not object to a little more light output.
  4. M

    driving LEDs, different drivers different light quality?

    Thanks for the input... Oh, yes, forgot to mention the 2200uf capacitor.... Yes, if I short out one LED the rest do get brighter. Also the Lm317s do have heat sinks and are almost cool to the touch, odds are one could support all the LEDs but opted for two just to be on the safe side. If I...
  5. M

    driving LEDs, different drivers different light quality?

    I finally finished my under cabinet LED light installation, I've posted here in the past about it. I'm using two different drivers, one I bought on ebay from China, it supports 16 LEDs at 700ma. I'm driving two 18" strips with 8 3.7v 700 ma 3K LEDS on each, connected in series. I inserted my...
  6. M

    Power supply help needed.

    Well i opted to just use the 25V tap on the transformer. Only capacitors available locally are rated at 50V DC. That given the regulated output was running 40.7 volts no load. If I divide that by 3.7v per LEd I get 11.02 so I rounded up to 12. I'm running at 560ma and 3.3 volts on the LEDs...
  7. M

    Power supply help needed.

    The 16 LEDs are replacing a 64T6 florescent tube that is rated at about 2800 lumen’s. And yes, there is a bit of "fun" to the circuit, sort of rediscovering my younger years when I was doing a lot of electronics. It's been a few decades and it's amazing what you forget and how doing things like...
  8. M

    Power supply help needed.

    Ah yes, it's a relearning curve for me... It's been too many years since I did any work in this area and thanks to the posts here and elsewhere stuff is coming back to me. I forgot about the 2v needed to keep in regulation. It looks like the limit may be 12 LEDS for the 50v output on the...
  9. M

    Power supply help needed.

    I had a small clip on heat sink, depending how and where I mount it I can go much bigger. I'll have to play around with the voltage, odds are the best option is to load it with a comparable load and see what the voltage actually is, open no load is not a realistic number. Since I'm doing a lot...
  10. M

    Power supply help needed.

    I'm in the process of replacing my under-cabinet lighting with LED. I have 6 fluorescent tubes of various sizes that I'm replacing. The largest is a 64" T6 tube. I'm replacing that with 16 3W leds. Here are the spec's. Specifications: LED Emitter: 3W - Output Lumens: 180-210 Lumens - DC...
  11. M

    Driving lots of LEDs in kitchen

    Ahh, thanks for the education. Now I get it, the 120 beam width works in my favor since the light "pools" will easily overlap. These are under-cabinet lights and the distance is a standard 18" to the countertop. For the rest of the application I'm looking at building a constant current supply...
  12. M

    Driving lots of LEDs in kitchen

    Thanks, not sure what cd is. The beam angle of the leds I bought is 120 Degrees. If I beefed up the power supply to one with more overhead would that not increase the light output? I wanted to run them a bit under their rating to generate less heat and extend life. I know the lighting will...
  13. M

    Driving lots of LEDs in kitchen

    Hi, newbie here. I'm replacing my under cabinet fluorescent lighting with led. I've bought a lot of bulk warm white 3v leds on star bases. My plan is to use about 58 leds. I know it sounds like a lot but based on my calculations that will generate about the same lumens I'm replacing. I'm...
See more

Latest posts

Top