But small enough as to be overcome by binning. It’s hard to say with what we have but the above would perhaps put the XP-P at about a lower bin Culnm1. So I think Agros point about whose die is better is right. It was very hard to find good bins for the Culnm1. So, if good bins of the XP-P come out, it does not seem unreasonable that it could equal or exceed what we can get from osram. Additionally I would happily take a little loss in performance for a warmer cct.
If datasheet is correct, it can't touch Osram at higher currents, and will not be able to handle overdrive like Osram.
Two graphs show this:
1) Flux vs temp - Cree (left) drops significantly more at higher temps:
2) Flux vs current - Cree(left) needs 3,0Amps to double flux measured at 1Amp,Osram needs only about 2.35Amps for the same 200% increase; at 3Amps Osram is at ~250%.
Cree at 3Amps (and that's with pulse testing at 25C) looks already close to its peak output, under real life testing peak would be probably at ~4Amps with lumen output marginally better compared to 3Amps.
Vf voltage is also significantly higher compared to Osram.
Agree - I noticed that flux vs. current chart and thought there's no way you 'd get anything out of 5 amps, maybe a little at 4 amps, if the LED can take 4 amps.
Well I guess I’m too slow on this one… I agree with Tom and L4P that the overdriving isn’t going to be there on this one if the prelim datasheet is accurate. 225% relative output max. At 420lm binning, maybe we see 945 lumens. Might be a more efficient alternative at the 3.5A range. Only one way to know I guess.
Thanks for the data sheet welight and thanks for bringing those charts together Led4power. It is unfortunate that the cslnm1 “handles heat” better than the XP-P. I was hoping the latter would do slightly better than the cslnm1 in that area and be able to be overdriven slightly more. The data sheet has bad news there. The good news is that if we can get top bins then it will still be close with a better color temperature.
The output curve sees to peak at ~225%
Even the best bin only does 400lm at 100%, so max would be 900lm best case scenario.
Still definitely worse than the CULNM1 unfortunately (4040 size), and probably also worse than the CSLNM1 (XP size) when you take into account thermals.
yup! or 4 of them in a KR4 or D4. I just sold my beautiful brass d4v2 with W2 because i couldn’t justify the 6500k tint any more… It’d be awesome to have similar range in a 5000k tint!
1.05*1.05 mm die though, so it’s going to need some miracles to compete with the white flats on brightness alone. Likely lower cost, better availability, 5000K cct, and 3535 footprint are a big win though. I like how the surrounding silicone pour is below the plane of the phosphor. This should make for cleaner beams / less artifacts. 3A vs 3A, it should hold it’s own. Looks to be not much room for overdriving. Let’s hope we’re wrong about that somehow.