High-power LED flash: too good to be true?

Started Aug 17, 2013 | Discussions thread
RumpelHund Regular Member • Posts: 186
Too good to be true unless you trick on the calculations

I work for years in industrial image processing with LED ring lights up to water-cooled units with line lights. My opinion: that product is wishful thinking to claim popping as a speedlight can.

Background:

To drive a fast pop of light you will need to insert very high power into the light bulb, LED or not. A battery is always limited in this regard, so you will either have to put more in parallel (higher voltage, possibly more amps) or bunker the energy in capacitors first.

In industry usually you take a rather high supply voltage like 48 volts with high power at hand (like 20Amp spikes), to drive a nativly 12V LED assembly and control the power spread by a controller limiting the amps . You can immediatly kill the LED if you like, to prevent it you will need to calculate the power used. Based on overdrive level and useage ratio. Anywhere between 100% power constantly and 10000% power for 1% of the time is fine as long as the head can spread.

My take is that they do rate the power as being equal to the speedlight at 1/8000s as the FP-mode speedlight is much much weaker than it is at full pop.

I think full pop LEDs will come eventually, but they'll need capacitors as well.

The industrial tools I use (and tried them for photography, no way useful) are in the range

http://smartvisionlights.com/

http://www.stemmer-imaging.co.uk/en/products/article/10164

http://www.gardasoft.com/LED-Controllers/

So I am sure it's a long way until LED for strobe will be cheaper at same pop as a speedlight. Happy to be proven otherwise...

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