Luxeon V2, a new led from Lumileds. In contrast what the name suggests it is not an upgrade of the Luxeon V, but a 3535 (XP-size) version, so smaller. Also other specs are a bit less, less maximum current (2400mA), higher thermal resistance (3degC/W), less output (760lm@2A). As the Luxeon V it only comes in 70CRI. Let’s see how it compares to the other 3535 leds around, SST-20, XP-G2, XP-L, Nichia 219C etc. The die size is said to be 2x2mm, which is the same size as XP-L leds, but led4power in post #4 points out that that is an error and must be 2mm-square, so ~1.4x1.4mm, which puts it in XP-G/219 class.
Die size is 2mm^2, not 2x2mm, that's an error. You can easily see that by binning/test current, Philips (and many others) use 350mA/mm2 test standard, Luxeon V test current is 1400mA->4mm2 die, Luxeon V2 test current is 700mA->2mm2 die.
This should be great,if not the best 2mm2 class 3535 led, light output is comparable to XP-G3 S5, but I expect tint/beam to have quality like its bigger brother Luxeon V.
Quote from first link: “LUXEON V2 is designed such that 99% of the light is forward directed, resulting in the industry’s most usable light from a compact source,” said Jennifer Holland, Product Line Director at Lumileds.
May this be the reason we see such good angular tint consistency in the Luxeon V? I wonder what viewing angle they consider “forward” and how that compares to LEDs with bad tint shift like XPG3…
EDIT: It appears from the datasheet that 95+% falls within 90 degrees of center. Vague claims like that always annoy me though. Curious how it’ll test in the real world and if maukka or anyone else could test this and compare between common emitters.
So would this be comparable with the XP-G2, with better technology? Excellent, small die emitters are always welcome. It was a disappointment for me when the XP-L was proven to have the same die size as the XM-L line.
It’s also very good for the “AAA or smaller” keychain lights with reflectors. I absolutely adore the balanced beam profile of the Lumintop Tool and the old XP-G2 Thrunite Ti3, which is impossible to get with a larger die like the XP-L which the newer, floodier Ti3’s tote in a (frivolous IMO) search for pure power.
Now we wait and see if this V2 will be able to compare to Cree’s HI emitters when dedomed so we get some cool thrower mods
The luxeon V does not throw well (with dome or dedomed), so if the V2 is similar it will also not throw well. Not trying to be a downer, but there is no reason to think this should out throw domeless XPL or XPG2.
Has anyone else tried these guys out yet? contactcr mentioned that he has and likes them… any other observations? Both DigiKey and Mouser have them (in both 4000K and 5000K) and I think I’m going to order some.
It is nice to hear though that in addition to the nice tint and optical behaviour in output it can compete with the XP-L2, I would not have expected that!
Edit: test is not underway, have not ordered any yet.
