Re: Ring lights

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Hiya Kostas :)


: Θέμα: Re: Ring lights


| Now Karl I think you are a case of developing Flashaholism
|   (being addicted to flashlight tech & paraphernalia.)

ah, it is true, though after accumulating an enourmous amount of flash
gear, I wanted something with continuous light, especially for macro work.


|   There is lot of issues regarding LED light, since it maybe
monochromatic but it is not always the same frequency from lot to lot
(called bin sorting). But that is a bit moot with digital macro. Infact all
my lattest close up shots were made with a new genration AAA light of
greenish tint.


Most LED's have narrow wavelength emissions, but the white light LED's use
a phosphor and emit quite a broad band of visible light.  Admittedly some
do exhibit 'tints', but I eliminate the off-colour ones and stick with
those that best replicate daylight (they rate at 4500K-10000K, I pick
around 6500-6700K).



|   Luxeon LEDs are now outdated since the new bread is 100% more
effective.
|   See Cree and Seoul Semiconductor offerings using the P4 die. And
begining this month it has been superseded by Luxeon Rebels


Rebels, Stars, K2's - whatever Luxeon LED model one uses, use the cool
white ones.    I see the 3W Stars yeild 80 Lumens  whereas the K2 6W
modules can produce 150 Lumen  so it kinda depends what you want, and
whether they're priced right (and whether you can dissipate the heat! :)



|   Anyone that wants to make a led setup of his own, he is about to dive
deep in converter circuits, heatsinking, wiring and current calculations.
PM for sources.

The regulator circuit is pretty straight forward.. here's a current
regulating one
<http://led.linear1.org/a-
cheap-current-regulated-luxeon-star-driver-design/>
but I've mostly used voltage regulators

Have you worked with larger units for portraiture?

karl



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