LED Group buy!
- Thread starter that0neguy1126
- Start date
How are the pots working on your dimmable drivers? Mine are not very linear. I have almost no adjustment until the very end, then Bang, full on. Initially I thought that I had dirty contacts. cleaned them and no change. Anyone else finding that yours are the same way? I'm looking into a suitable replacement to try and get more adjustability out of mine.
It's more of a function of the LEDs. They have to reach a certain voltage before current passes through them and they turn on, meaning the instant they come on they're at a level of brightness that's more like medium. The only way to get the full range of brightness between OFF and full power is with pulse width modulation.
Its kind of a double problem. The output of the driver is not linear when dimmed. Also like Dan said, the voltage curve on the LED is not linear. So when you compound both of these, you have a really high increase from like 0% brightness to 70% brightness over a very small amount. And then it takes a long time to go from 70% to 100%.
Screwed up meaning that it was 200 ohms instead of 100 ohms and the wiper would only go to a low of 100 ohms.
Manageable meaning that it increases brightness to a certain point then if you move it a HAIR more it will go to full brightness.
I'm not worried about getting replacements. I'll just order from the States if I feel that anal about it hehe.
I'd like to get some more LED's but I don't know if add ons are allowed.
Manageable meaning that it increases brightness to a certain point then if you move it a HAIR more it will go to full brightness.
I'm not worried about getting replacements. I'll just order from the States if I feel that anal about it hehe.
I'd like to get some more LED's but I don't know if add ons are allowed.
I don't know about you guys, but when you use the dimmer, the current changes with it as well. I hooked up a DMM in series with the LED and when I control using the control wire, the current through the LED also changes. So it's not a constant current driver. I have a 22AWG wire going to the LED, I'll change it out to 18 this weekend to see if that will improve the currents.
It is a constant current driver. It's just a dimmable constant current driver, in order to dim it the current through the LED's must go down.
The rheostat tells the circuit how much current to push through the LED's.
18 guage wire may make it more difficult to put the optic in place. I'm using 20 guage wire (solid) and I had to resolder some of my connections because the optic
would hit the wire sometimes.
On a side note.....did anyone have to resolder their LED's onto the star? I found one LED that had lifted at the positive pad. Thank God I checked and rechecked my
connections or I would have missed it.
The rheostat tells the circuit how much current to push through the LED's.
18 guage wire may make it more difficult to put the optic in place. I'm using 20 guage wire (solid) and I had to resolder some of my connections because the optic
would hit the wire sometimes.
On a side note.....did anyone have to resolder their LED's onto the star? I found one LED that had lifted at the positive pad. Thank God I checked and rechecked my
connections or I would have missed it.