Bob_McBob
(Bob_McBob)
September 14, 2019, 8:12pm
23
My sm653 Wizard has a much higher CCT with the bare LEDs measured head on than it does with an optic.
Turbo 2
CCT = 8792K (Duv –0.0082)
Color Rendering Index (Ra) = 93.4 [ R9 = 78.4 ]
Main 3
CCT = 7950K (Duv –0.0031)
Color Rendering Index (Ra) = 95.8 [ R9 = 87.2 ]
With the optic, the hotspot is 7301K and 6819K on the same levels, respectively. Sounds like your LEDs are behaving normally.
clemence
(clemence)
September 14, 2019, 8:20pm
24
Forgot Joshk tested the LED at max 2A. That’s beyond the 1400mA limit for E21A. So, that’s normal. Maukka tested the LED according to Nichia’s binning current at 700mA.
[Clemence]
Joshk
(Joshk)
September 14, 2019, 9:32pm
25
I got the Fluke out and perfected the Amps at 700 and ran the test again. Then graphed it all together.
—0 Degree 700ma—
CCT: 5949
Duv: –0.0058
—45 Degree 700ma—
CCT: 5390
Duv: –0.0017
Bob_McBob
(Bob_McBob)
September 14, 2019, 11:22pm
26
When you put that in an optic or reflector or integrate the measurement it will probably end up being about 5000K.
Joshk
(Joshk)
September 14, 2019, 11:36pm
27
I sure hope so. I’m learning as I go. Thanks to everyone for the help.
To be continued…
staticx57
(staticx57)
September 15, 2019, 12:56am
28
Would like to see the 90 degree measurement. In order to average to 5000k somewhere else in the beam would have to be less than 5000k.
Joshk
(Joshk)
September 15, 2019, 1:16am
29
The CCT measurement near 90 deg is 4700K, but it’s not all that bright out there.
WTF
(WTF)
September 15, 2019, 2:11am
30
Does this mean Fet drivers are a bad choice or is 1400ma average current OK?
staticx57
(staticx57)
September 15, 2019, 3:20am
31
Depends, what cell are you using? Quad E21A behind a 10440 would be fine. Behind a high drain 18650 with springs and all bypassed might not.
WTF
(WTF)
September 15, 2019, 4:23am
32
Haven’t built the light yet. Thinking about converting an old srk style light into a mule using the existing led board.
SKV89
(SKV89)
September 15, 2019, 5:38am
33
With and without optic or reflector makes a very big difference in both CCT and tint. Here are two examples with the SST-20 4000K. Bare emitter is always much cooler.
Just received my sand color SST-20 4000K one. It is a little brownish in color but very nice. The real think looks and feels better in the hand than I expected from pictures. Feels very heavy and solid (heavy = good thermal mass for heat sinking) I also like the functional deep heatfins. Just wish they got rid of the tripod mount to make room for more heat fins for better cooling since I doubt many people will use the tripod mount. You cannot unscrew to lockout the light as others reported. Here…
Copper version with optic and glass removed on turbo.
CCT: 4556K
DUV: –0.0096
CRI: 95.2
Gray aluminum with optic and glass removed on turbo.
CCT: 4404K
DUV: –0.0109
CRI: 95.7
MF01S with optic and glass removed on turbo
CCT: 4355K
DUV: –0.0096
I have a feeling both of these are FD2 tint bin because from what TA said, there was an extremely limited number of FA3 tint bin on the market in the range of 1,000 pieces only. Fireflies said Luminus recently wanted to make some more FA3 tint b…
djozz
(djozz)
September 15, 2019, 9:50am
34
There are just so many variables.
Like the current, and the angle at which you measure the bare led. A diffuser like dcfix will average it somewhat but will still only catch and diffuse less than half of the light. Moreover, a any diffusor causes loss of blue light and warms the tint because of blue scattering more than the other wavelengths. Using optics selects other parts of the light again.
The only way to measure average tint is with an integrating sphere coupled to a spectrometer. It integrates the full 180 degrees of output and the sphere can be characterised by measuring the colour-specific light loss over the spectrum and correct for that. Maukka is the only amateur I know of to have that setup and post results with it.
Joshk
(Joshk)
September 17, 2019, 3:46pm
35
Update, I got a reflector in the mail yesterday for another project that happens to fit the E21 perfect. The results are much improved.
CIE
Ryzbor
(Ryzbor)
September 17, 2019, 6:07pm
36
Did this particular TIR lens, it seems a narrow one, result in a cross pattern in the beam?
Joshk
(Joshk)
September 17, 2019, 6:12pm
37
No it looked like a normal beam with a round hotspot.
Ryzbor
(Ryzbor)
September 17, 2019, 6:20pm
38
Interesting. Which particular TIR did you use?
Joshk
(Joshk)
September 17, 2019, 6:48pm
39
I’m not sure I can reveal my source. It’s a trade secret
Joshk
(Joshk)
September 17, 2019, 7:02pm
40
Joshk
(Joshk)
September 18, 2019, 3:52am
41
I gave the DC fix a try today. Too close, and it doesn’t diffuse well. Too far and it doesn’t catch the warm light. It needs a reflector. I made a 13mm high reflector for it, but the light from the E21 is so concentrated it was still too close. Drr. I’m not sure if I will continue the project, since the E21 hates 2amps anyway.
Joshk
(Joshk)
September 23, 2019, 6:37pm
42
I tested with all different powers on this new thread:
Alright, my last post about the E21A was more of a discussion into why the results sucked. The conclusion in the discussion seemed to suggest I needed to turn the power down to achieve perfection. So here is the official review, with a whole range of power levels (verified perfect by my Fluke), a fresh dark-calibration in the meter, and just a do-over in general for everyone’s sanity. Let’s see how this goes.
I am testing a:
Quad E21 “NVSWE21AT 5000K sm503-D240-M1-R9080” from Virence.com
[ima…