I continue to research external lights and I am pondering the best light “temperature” in Kelvin. At 5500K we have white “daylight” of the noon day sun and at 3000k we have the warm glow of light bulbs or afternoon sun. The later is better for photos of course, but is that what we want?
We know that blue light travels a lot further in water than red light. The best “light” for seeing into the distance seems to be about 500nm. That may go twice as far a yellow light. So is that the light we should use for steering and navigation? Especially when it is really dark like in a mine shaft or a cave?
The catch is that a color temperature in Kelvin is a full spectrum light source, so we have to approximate to find the best light.
Col temp (Kelvin) = 3,000,000 /Wavelength (nanometers)
So 500nm suggest we want a color temperature of 6000k.
My current external lights (below) are in the middle at 4000k, but I just ordered some that are 5700k and some that are 3000k. Has anyone else made a comparison or thought about this? Should we just be using blue LEDs for navigation and then turn on white lights to film?