Hi all, new member just came across this thread. Figured I could help ya out as you have helped me out with info!
XML EZW U2 bin is far to inefficient to give lumen output they state. 695lm out of chip @ 2A, 6V (max reccomended). It's usually a warm white bin as well lol.
So must be U2 XML well over 3amps if they are telling the truth, which I doubt. Should loose 100-200 lumens per side with those optics. Bit more frosting would help with shadows. With the heatsinks they have I highly doubt they can cool them sufficiently, real output degrade to perhaps 1300lm or less over warmup time. Dissipating 13-15w+ efficiently isn't easy with size and cost constraints. Unit looks okay, wonder what PWM frequency it is though, just don't expect 2000lm, you won't really see a huge difference anyway. Also the charger they include is not bad, I've used one for a while and traveled without hassle.
Colour temp will be blueish, cri is 65 for the cool whites - I have most of the various XML tints and bins for R&D, cools are all quite blueish or greeny to me, warm/neutrals I prefer if only one led is possible.
For video I've used 5000k 65cri cools, xpg and 4000k neutral xpg, preferred neutral, much more realistic, not canned tv tint. My XML film light will be built q1 this year with some cool mods to come :)
Aunty cree says:
• Cree maintains a tolerance of ± 7% on flux and power measurements and ± 2 on CRI measurements .
• Typical CRI for Cool White (5,000 K – 8,300 K CCT) is 65.
• Typical CRI for Neutral White (3,700 K – 5,000 K CCT) is 75.
• Typical CRI for Warm White (2,600 K – 3,700 K CCT) is 80.
High CRI is available for XML EZW in cool white, but not 92 cri, it's 80. They could be using them, however still can't remotely touch the output claims. And good luck obtaining or finding some of them, I'm having a nightmare trying to find warm white 90CRI for other designs.