If only this product gave us a range of choices to reduce a specific portion of the spectrum so we could just slightly reduce a specific portion of the spectrum. I also jokingly said "Yes if only someone could create a product that would reduce those spikes in LEDs to shift the SPD into a form more pleasing for the camera or to match it with other sources. I also noted that with so many different manufacturers of LEDs, getting consistency or quality is harder to achieve than other sources as there are less companies producing those sources, HMI for example. I agreed that the green spike are an issue and some LED manufacturers address it better than others. I knew I would need to modify the source to balance it on camera and the degree of correction would not be exactly the same for each arc fixture. I also looked at evenness in the Magenta of a CYM colour mixing fixture especially in a very pale magenta. ![]() With the implementation of variable CTO, I looked for evenness in the beam. My criteria for moving lights, that I may use on skin tone, was the quality of colour correction filter in them. I also mentioned I used to be an automated lighting programmer and when I homed all of my moving light rig onto the stage floor I could see all the variations of the Arc sources, even if I had specified all new bulbs in the fixtures. I said HMIs also have spikes and as they age they usually shift into the green thus making a bulb that has been running several hours a different colour quality than a fixture that has a brand new HMI bulb. I said yes true for some LEDs but what about HMIs? Some of the DPs knew where I was going with this. My response raised some smiles from some other DPs. I did a talk about LEDs to ICG members and a DP said that all LEDs are bad due to the green spikes in them. Yet for some LED lights are treated like an alien form that has nothing to do with the physics of light and its relationship to the camera. For me LED is just another acronym for another light source. ![]() More recently LED sources are being used. ![]() Some examples are CSI, HMI, Xenon, Plasma, HID, MSR, FLOs, Laser, Neon, Tungsten, Carbon Arc etc. For many years we have had a wide variety of artificial lighting sources used in lighting for camera.
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