The new Luxeon V2

Flashlight Modding and DIY Parts
12

Thanks.
So it has a smaller die: V2 = 2mm² and V = 4mm²

13

Luxeon V has 4mm2 die, V2 has 2mm2 die.

14

Agree, not sure I was able to explain it well but glad you had similar results.

This LED should compete with any 70 CRI LED out there and has a good balance of output, tint and uniformity with a good price.

15

Quite a few 2 mm² LEDs in 3535 factor showed up recently…

  • Luminus SST-20
  • Osram PM1
  • Luxeon V2
  • (not sure) Nichia 119D / 219D

Nice!

It’s flip chip, right? Does it have any throw?

16

Yeah, I think its a flip chip:

Comparing two Convoy S2’s side by side; one with LH351D and one with Luxeon V2, the throw of the Luxeon V2 kills the LH351D. But that doesn’t take much, the LH351D is a very floody LED.

I’ve had a lux meter (UNI-T UT383BT) for about a year, but had never taken it out of it’s package until today. I tested just a couple lights before running out the door this morning, and unfortunately I didn’t have quick access to the Convoy S2 with LH351D in order to get numbers on that; hopefully I can tonight. Here’s the 3 I was able to test (so you have something to compare against in case my numbers are skewed):

  • Convoy C8 with 3.08A Qlite and XP-L HI V2 5000K: 2818 lux at 5m → 70,450 lux
  • Convoy M1 with 3.08A Qlite and XP-L V6 5000K: 755 lux at 5m → 18,875 lux
  • Convoy S2 (smooth reflector) with 3.08A Qlite and Luxeon V2 4000K: 549 lux at 5m → 13,725 lux

Do those numbers sound right? Since these aren’t real throwers (perhaps with the exception of the C8), should I measure at 3m (or even 1m) instead of 5m?

17

Without being scientific it does appear to have more throw than a LH351D but with the dome on I don’t think anyone would consider this a thrower. Not sure how it performs dedomed and I think thus far only gchart and I have even tried them in a flashlight.

I have a C8F with 3x Luxeon V and when I compare it next to a LH351D of the same type there isn’t a huge difference in the overall beam. It’s a more intense hotspot but not by a huge amount.

18

If I’ve got time tonight I’ll try getting side-by-side numbers with the same flashlight setup using Luxeon V2, LH351D, XP-L, and XP-L2. I’ll see what else I can scare up, maybe a XP-G2, XP-G3, SST-20, XP-L HI. I’m pretty sure I’ve got all of those on hand, it’s just how much time I’ve got to swap in and out a bunch of different LEDs.

19

Here’s a mechanical comparison of the domes of the SST-20 and Luxeon V2. SST-20 is quite a bit smaller in all dimensions and LH351D is slightly larger in all dimensions.

20

I suspect this wont be too helpful but I measured two C8F’s at 380mAh (1x7135)

LH351D 4000K 90CRI
131 lux

Luxeon V2 4000K 70CRI
268 lux

Measured at maybe ~15ft

21

Wow. Having 1/2 the die size REALLY helps with throws.

Then again, the LH351D is a 90CRI emitter, so the results aren’t TOO accurate, but are representative of real life.

22

Ok… here’s some data points. I can’t say that these will be consistent with what others may gather, but they should provide a fair comparison against each other since they all came from the same flashlight, same battery, same physical measuring setup, etc.

All tests were done with a Convoy S2 (not S2+) with a smooth reflector, 3.08A Qlite driver, and a freshly charged Samsung 30Q:

  • Luxeon V2 4000K: 11,898 lux at 1059 lumens
  • XP-L V6 5000K: 8,604 lux at 1202 lumens
  • SST-20 Cool White: 17,919 lux at 933 lumens
  • XP-L HI V3 5000K: 14,670 lux at 1007 lumens
  • LH351D W6 5000K: 6930 lux at 1161 lumens

These tests done at ~10 seconds and 3 meters.

23

Do you have 5 lights or you swapping led’s?

24

That was from swapping LEDs into the same light, driver, battery, etc.

25

Wow, thanks for the effort. I am interested in these but just don’t know where I would use one.

26

Thanks!
The comparison to SST-20 is especially telling. V2 gets 11.2 lx/lm while SST-20 gets 19.2. So….in my book it counts as a pure flooder LED.

27

Nice direct comparison gchart! :sunglasses:

28

I was pretty shocked by that, I bought 10 of the SST-20 a while back when they were first announced and all that was available was cool white. But I strongly dislike cool white, so I never ended up putting them in anything. I’ve heard the chatter and knew they could throw, but I just didn’t expect the lux to be that much higher, even over the XP-L HI (with the SST-20 still having it’s dome on).

29

What if you put it up against a XP-L HI V3 1A 6500k? Seeing how light meters supposedly read/register CW higher?

SST-20 Cool White: 17,919 lux at 933 lumens
XP-L HI V3 5000K: 14,670 lux at 1007 lumens

30

Maybe this emitter is better suited for aspheric and recoil lights. I think I read somewhere in djozz's thread that something like 90% of the output is goes forward. Wouldn't that mean less light hitting the reflector (in a reflector light) which would result in less throw?

31

The radiant power chart doesn’t seem much different from SST-20-W.