Re: Timing requirements for LED's to start illuminate

On 27 Jun, 11:58, manusha1...@xxxxxxxxx wrote:
im trying to build a camera flasher that uses 400 white LED's.
For timing purposes, i need to know timing requrements for LED to
illuminate once
it is forward biased (ON time). Similarily need to know OFF times as
well.

for this i checked several datasheets, but non of them mentions
anything like that.
im wondering whether LED's are instantaneous, so that "T on" and "T
off" are 0. Is this correct?

the reason to use LED's for this flasher is because it needs to
continuously work at a rate of 600 flashes per second.

thanks

WOW.
Powering 400 XR-E's at 1amp may produce around 30,000 lumen. Assuming
a polar of ~ 1 steradian this will be around a 360,000 Cd source.
This will be illegal to use.

Why must you flash it?

I dont fancy making the power supply (~1.5kW!) if it is to run off
some AA NiMh batteries.

Why so many leds?

What is it you are trying to achieve?

If you give some more details then we may be able to help.

.

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