Led4power.com sent me a Lumileds Luxeon MZ LED (3V) for color and CRI testing.
Datasheet:
I tested the 3V version, but there’s also 6 and 12V versions of the LED.
The sample came already reflowed on Led4power’s 20mm DTP MCPCB. The Luxeon MZ has a 4040 footprint and may be difficult to solder onto an 3535 XP/219 board, since the solder pads are not exactly the same. It should be possible though.
All tests except for tint vs. current were measured at 2800mA at which the Luxeon MZ is specified.
I tested the emitter bare without a reflector and with a medium sized orange peel reflector from an Olight M2R.
As was the case with the Luxeon Z ES I tested earlier with a bare emitter the 0° angle tint is perfect at duv –0.0005 and 5750K. There’s is still significant tint shift when the observation angle changes, but not as much as with the Luxeon Z ES.
With a reflector this results in a slightly greenish hotspot (duv 0.0042). The shift within the beam is very small and totally a non-issue which also makes the slight skew above the BBL pretty easy to ignore.
On the other hand, there is a dark spot in the middle of the beam (donut hole). With the M2R reflector it wasn’t too horrible and probably wouldn’t matter that much in real use. Even with the dark spot and a slight greenish tint I would rate the beam consistency as good. For perfecting it, use a diffusing optics and a minus green filter.
The color temperature increases and the tint moves below BBL with higher currents when the emitter heats up. With better cooling the shift is smaller.
CRI Data
The Luxeon MZ sample meets its specification of CRI (Ra) 90 and even exceeds R9 90 sometimes.
Bare emitter 0°
With M2R OP reflector at the hotspot
Current/heat doesn’t affect color rendering very much. This test was done with bad cooling.
200mA https://i.imgur.com/UzpgsCf.png
1400mA https://i.imgur.com/JYYSJRd.png
4800mA https://i.imgur.com/7rL67Ur.png
6000mA https://i.imgur.com/ALJHe2F.png
Output
Output in lumens and forward voltage up to 6A with the MCPCB mounted on an aluminum heat sink with fan cooling.
Measured in a 50cm integrating sphere