Nice find!!! This is great!!!..so the D1s and flat black are secretly the perfect match. I love how little spill the corona has now.
I’m still alil confused on how the head is electrically isolated. Is it simply the thick anodising emisar uses? Because I dont recall ever seeing a grommet or spacer in-between the head and body?
Definitely a match made in heaven, the thick anodization insulates the driver from the head because it’s simply push fit into the light so therefore the negative outer ring on the driver only makes contact with the body and it’s electrically isolated from the aluminum in the head, as we were saying before if you take apart the D1S from the top of the tube near the head the threads will wear off the anodizing from friction and will soon ground out to the head and ruin the connection once it wears off but you can take care of that by only unscrewing from the bottom of the tube.
You may want to hold off on that order. I'm getting lousy measurements. Higher Vf's and lower calculated lumens then both djozz and koef3 reported. Please keep in mind that my lumen calculation could be way off as I haven't really spent much time working on my integrating tube and have never measured a bare emitter. I hobbled a set up just a bit ago. So there is all kinds of potential for errors. Conversion factor derived from maukka calibration lights.
Current
Vf
Lux
Lumens
1
3.14
364
245
2
3.49
617
415
3
3.78
814
547
4
4.04
955
642
5
4.31
1040
699
EDIT: Improved the setup up. I was losing lumens around the heatsink. I resolved that a good bit, but am still losing some lumens. My new measurements are as follows:
I definitely was a bit disappointed in the Vf results. The reading seems reasonable according to the bins listed in the datasheet. Used a DPS5015 to provide power and to measure Vf. Used about one foot of 18 gauge leads. Didn't see signs of thermal sag.
I will remeasure tonight with a meter directly on the emitter.
You weren't kidding. I was expecting a small difference, but was surprised. I verified power supply readings at the power supply terminals, no problem. Then measured at the emitter pads. I read 3.02, 3.23, 3.42, 3.60 , and 3.80 volts at 1 through 5 amps, respectively. Good news from an emitter efficiency standpoint. Thank you for sharing your observation The_Driver.