I'll start this thread with a set of reference graphs using Blue, Green and Red LED's directly into the spectrometer. These tiny surface-mounted LED's are the same as what's inside of the 56, 62 and 100 mm LED light rings.
Click on pix for larger view
The Blue LED has a peak wavelength centered at 470 nanometers, while the Green is 512 nm and Red has a primary peak at 622 nm. Red also has a peak around 600, another at 612 and a 'roll-off' at 639 nm. Quite a wide range for red.
Lets use these graphs as reference for additional graphs with different grades of Ferrocells. The type of glass and its thickness, plus nanoparticle density determines how much of the higher frequencies (smaller nanometers) can pass through the cell. Cells are identified from Heavy to Ultra-light grades. Medium grade is the most economical to make. Ultra-light cells require high quality glass in order to get the disks close enough to allow such a thin mixture without making light and dark patches of fluid visible. (to be continued...)