Presume a worst case scenario. Most useful input voltage value to make an output measurement is, in my opinion, the smaller voltage at which it still can maintain regulation. With an XM-L2 at the output most 7135 linear based drivers will maintain regulation at least down to 3.7V, and if PWM frequency is too high the voltage figure for mid and low modes will be even higher. Of course this is not based in 7135 regulators, but I said that to put this into perspective. That driver may not be able to stay regulated within an usual loaded li-ion voltage range (3 to 4V). This is how I believe we should teach these fellow testers how should they proceed. Thus, to answer your question:
Current is measured at 4.6V because the driver is a PoS and cannot stay in regulation below that voltage. Done.
Not exactly that, glide 1. That thing sort of pissed me off a little bit, I find it misleading. For a linear driver like that, I'd prefer to see the figures for ≈3.7V (or the minimum input voltage at which it keeps regulation -specifying the driven emitter-) and maybe somewhat below to see how it evolves.
This is not to say that 4.6V figure is not useful, it may be a useful figure for those aiming to use 4S Ni-MH input at the driver. Even in such a case, I'd complain because I always want to see worst case scenario figures, which for 4S Ni-MH would be below 4V.
Accepting those figures would be like accepting Ben Johnson's Olympic 100 Meterfinal record in Seoul, 1988. Sort of.
If you could please look out for SST-40's in higher bins, and lower temps, like 4000K-5000K. I got in 3 of your SST-40's - will be testing them soon! Everyone who has used them got good results.
Yes! I would like to see the higher bin SST40’s also! :+1:
I would like to also request Higher Bin XHP35’s E4+ and Colder Tints 75000-8000k if possible please! I have purchased many of the E2-1A’s HD’s for de-doming, best tint so far 5200-5000k, no yellow, a very nice neutral white. Would like to shoot for something around 6000-5700k de-domed.
In the PDF under the flux bins it says “Forward Voltage Binning Structure”, and it ranges from 2.5 to 3.3 Volts (!).
But i see now it also says: “Individual voltage bins are not orderable”.
So never mind then… :zipper_mouth_face:
Just have to hope to get a good one. The VJ bin KD has is pretty good, with VH being the only one better. A higher flux bin with a lower voltage bin will be more efficient.
Ohhh - yes, forgot bout those specs. KD's SST-40's are marked as VJ, so should be 2.7V-2.9V, which is pretty low, and explains the high amps we can get from them. Yes, it's certainly something that is nice to know up front what that rating is when we order them from other sources. Fortunately, KD has been pretty good with giving us the details on bin, tints, manu part #'s, etc.