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 | Luxeon LEDs are now outdated since the new bread is 100% more effective.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 And begining this month it has been superseded by Luxeon Rebels Rebels, Stars, K2's - whatever Luxeon LED model one uses, use the cool white ones.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
