Electronics > Projects, Designs, and Technical Stuff
Ultra Short, Ultra Fast LED Flash
Marco:
--- Quote from: JAndrew on March 09, 2019, 05:47:54 pm ---Hmmmm, my first impression is that that’s beginning to touch on the realm of impractical.
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That's only if you want to get that bright, you can make do with a lot less light. Look at the Vela One, I'd estimate they are doing closer to 5 kW, 200-300 Watts worth of COBs.
StillTrying:
--- Quote from: JAndrew on March 09, 2019, 08:16:07 pm ---The stored energy of approximately 8 J is released in a short flash of less than 500 ns.
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16 MW. :)
JAndrew:
Huh....ok, so I'm not completely out to lunch... so they have something pretty neat but it's unobtainable. I think I remember seeing this a few years ago, and it looked great but it was not available then either.
So from the description they are using 9 5000lm COB LEDs over driven by 2000% to produce 1mil lumen. This is all driven off a four AA batteries.
What sort of wizardry do they have going on?
JAndrew:
Looking around for LED COBs
https://www.ebay.com/itm/100W-Cold-White-High-Power-9000-10000LM-LED-light-Lamp-COB-Chip-35DI-/391802735671?_trksid=p2349526.m4383.l4275.c1#viTabs_0
Pretty inexpensive for 10,000LM, but if I drive these by 1000% and get 10 of them. Then I could match the 1mil Lum. However the power requirement would be pretty high as well. Input current under normal operation is 3000mA and voltage is 32-34vdc.
This isn't something I could drive with 4 AA's.
ogden:
--- Quote from: JAndrew on March 09, 2019, 08:59:22 pm ---Pretty inexpensive for 10,000LM, but if I drive these by 1000% and get 10 of them. Then I could match the 1mil Lum.
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10K lm? - Scam. With such specs he can put OSRAM out of business, yet they are doing well :) You may indeed user those to start with, but do not expect to get even close to specified light output.
--- Quote ---Input current under normal operation is 3000mA and voltage is 32-34vdc.
This isn't something I could drive with 4 AA's.
--- End quote ---
It is easily achievable with 4AA's - in pulse, from charged flash capacitor. After all this is how Xenon flashes/strobes work for decades and those guys are doing exactly that: https://www.vela.io/vela-one-high-speed-flash
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