Yes, E17A and E21A is MORE than acceptable. It’s another “219B/C HI” with wide range of Ra9080 [2700K-5700K]
No I meant, I literally asked one of the Nichia guy and also read at the hardcopy catalogue. And the most “flashaholic acceptable” answer were some DIP and NCSL types.
Different standards…
Yes, except for AAA lights there is basically no situation in a flashlight where a 5050 footprint would not fit and it offers a much much much larger thermal pad which can only be a good thing.
Plus 3535 LED’s are generally rated for a max of 2A where 5050 generally get rated for 3A. Obviously showing an improvement in thermal path to some degree.
Exactly how much of an effect it would have, I am not sure but I have seen a consistent limit of between ~35-40W for the Cree 3535 LED’s and around 20-25W for the nichia 3535 LED’s.
Having seen this on many LED’s, the results would seem to lead to something besides just limits within the die itself and more in the thermal path.
Much like the first and best place to get more traction in a car is wider tires, I feel that starting with a larger thermal pad is the first thing that should be done with LED’s.
But then I am the guy that will cram 325’s on an MR2 and then run drag radials on top of that to multiply traction even more. (for those not car guys, this is roughly the equivalent of a 8x XHP50 SRK making 17,000 lumens in the flashlight world, not completely unheard of but WAY overkill).
I will admit that I am bummed he was the first to make a true 100k lumen flashlight. I have actually been working on a setup that should do this for this years OL scratch build contest.
Seeing as 100k lumens would be around ~1200-1400W and at most would run for ~10 minutes off 2x massive lipo packs (and yes, my planned build should be able to run the full ~10 minutes at roughly full power without overheating), anymore then this would be a bit impractical for more then a 30 second burst but mostly due to shear size it would take for the optics.
Any details on the Vinh light? Curious how he is cooling it. It will be producing about the same amount of heat as a space heater, heat gun or microwave.
XHP70s are easier to drive from Li-ions than most COBs, and I imagine he has a bunch of XHP70s just sitting around anyway. I don’t think practicality was a concern - he probably just wanted to be able to say “100,000 lumens”.
I prefer practical lights too, and nice color over raw output, hence the Nichias.
Hmmm, based on that picture he is pushing things very close to the limits at 100k lumens. I saw that he said it was a test rig but still, it appears he is driving them off of 18650 cells.
Long story short I would love to know how many 18650’s he is using and how they are setup.
I built a “mega-M6” with 12 of these 319A 5000k 80CRI. They work great and have a great beam and color, output is good as well, although not quite up to XP-L levels. The Low VF means that they will pull a lot of power though, so watch out if using an FET driver.