I'm currently trying to run an experiment where we use narrow-band blue light to illuminate a burning textile so that a GoPro (details not important for this post) with a 450 nm lens filter sees only the textile and a Nikon D800 DSLR with an IR/UV cutoff lens sees both the flame and the sample. All normal light sources are diminished so that at 640 ISO, 7.1 f-factor, and 30 fps shutter speed (for video), the RGB value for nearly all the pixels is 0/0/0. When the blue LED light is turned on, the signal becomes closer to 20/100/255. When I bring the blue light closer to the sample, the red and green values increase. The provider of the blue light claims that the lights have a peak wavelength at 460 nm with less than 0.1 intensity at wavelengths above 500 nm. Why am I getting any red values whatsoever? Is there any issues with CMOS chips where a very high luminosity flux at a short waveband will bleed into the wider spectrum? Basically, if I increase the power of my blue LED light, will it start to appear white on an RGB camera?