Update 21.7.2018: More color temperatures tested in post #7.
Clemence sent me the Nichia Optisolis in 3000K and 5000K flavor for color and CRI testing.
The exact model numbers are:
NF2L757G-F1
NF2W757G-F1
There was four samples of both and they came already reflowed on Virence VR16S1 DTP MCPCBs. Each board had two emitters wired in parallel. The other pair will continue its journey to Koef3 for further testing. Also check out Djozz’s output test here.
The emitters are specified for up to 150mA (3000K) and 100mA (5000K) continuous current, but according to Djozz they seem to handle larger currents fine.
CRI and color testing was done at Nichia’s recommended current of 65mA (per emitter). For the tint vs. current test I ran my samples up to 200mA.
All tests were done with bare emitters with no reflectors or optics used.
Setup:
There’s practically no tint shift at all. Not with varying current or measurement angle. The tint is also excellent landing on or near the BBL.
The point of the Optisolis is color accuracy, which is excellent. I measured CRI (Ra) at 97 (3000K) and 99 (5000K) and R9 at 94 (3000K) and 93 (5000K). CRI also doesn’t change with current. The 3000K version seems to over saturate colors according to its TM-30-15 Rg value of 104. The 5000K one is more faithful at Rg 99.
The two different samples are very consistent. There’s very little difference in the spectrum between them.
CRI Data at different currents (per emitter)
Forward voltage up to 400mA (200mA per emitter).
The Vf is about 0.1V higher on the 5000K model.