Driving an XPG=2

[BanglaBob]

How hard can I drive an XPG-2 (s2) emitter? Seems to me the nominal drive current is 1.5amps.
Advice please?

[Xandre]

Crash-testing a XM-L2 and a XP-G2 on copper Sinkpads

I promised that I was not going to do more testing on bare leds because I do not have the equipment to guarantee accuracy of the numbers..... Ok, one more then, because I am really curious what the limits are for copper-mounted leds (mounted well and heat-sinked well), I can not find anyone who had tested that before, and as a modder I just want to know that . I borrowed a bench power supply from work that can deliver up to 40A and decided to sacrifice a XM-L2 and a XP-G2. I had bought those b…

Think at the heat and the size of pill…

High Amp only with best cooling…

[downlinx]

There is a member here trying to make a Y3 300kcd with a g2. I do not know how hard he is driving it, but he has built all his own drivers.

[Legolas_Jr]

You should be able to do 4.5 amps no problem if you need to. What are you planning to put it in?
Edit: if you dedome the xp-g2, based on the results of many BLF members, you will probably have a hard time getting more than ~3a from it with a single cell. Something about the dedoming process seems to raise the forward voltage.

[djozz]

@Legolas Jr.

You should be able to do 4.5 amps no problem if you need to. What are you planning to put it in? Edit: if you dedome the xp-g2, based on the results of many BLF members, you will probably have a hard time getting more than ~3a from it with a single cell. Something about the dedoming process seems to raise the forward voltage.

As far as I'm concerned the raise of voltage upon dedoming is a myth.

[Legolas_Jr]

@djozz

@Legolas Jr.

You should be able to do 4.5 amps no problem if you need to. What are you planning to put it in? Edit: if you dedome the xp-g2, based on the results of many BLF members, you will probably have a hard time getting more than ~3a from it with a single cell. Something about the dedoming process seems to raise the forward voltage.

As far as I’m concerned the raise of voltage upon dedoming is a myth.

Well, you know far more about the subtleties of LED’s than I do, so I’ll back down… Out of curiosity, though, what makes you say that?

[djozz]

@Legolas Jr.

@djozz

@Legolas Jr.

You should be able to do 4.5 amps no problem if you need to. What are you planning to put it in? Edit: if you dedome the xp-g2, based on the results of many BLF members, you will probably have a hard time getting more than ~3a from it with a single cell. Something about the dedoming process seems to raise the forward voltage.

As far as I'm concerned the raise of voltage upon dedoming is a myth.

Well, you know far more about the subtleties of LED’s than I do, so I’ll back down… Out of curiosity, though, what makes you say that?

I have never seen hard figures about it, just 'I have the impression', I did recently a dedome of a XM-L2 3C with voltage measurement before and after (it is in my XP-L test thread somewhere), and did not see it happen. Further I can not think of a reason how dedoming could physically result in higher voltage. This all makes me wonder...

[Ledsmoke]

Perhaps the percieved brightness loss makes people want a tangible reason. BTW: I've never seen a very high output loss from dedoming either. Maybe because I file away the flat part of the reflector on my throwers to get the led better into the thing. I've read 20% somewhere and it has been repeated many times but in my measurements it has never been more than half of that. So I guess YMMW ? I have no answer. Just observations. :-)