Spectral outputs-college instrument+filters
Spectral outputs-syntonics filter transmission spectra
Syntonic filters-Roscolux-transmission spectra
Syntonic filters/ graphs, Lowenstein study
Syntonic filter curves, combinations - Curtis study & opinions
| Roscolux filter # | Greek letter/ filter name | Color |
| 27 | alpha | red |
| 15 | delta | amber |
| 90 | mu | green |
| 74 | upsilon | dark blue |
| 385 | omega | violet-blue |
| 77 | pi | bright blue |
| 14 | theta | yellow |
| 378 | lambda | blue |
| 4790 | N |
Neurasthenic (magenta) |
| 3204 | D |
Depressant (blue cast) |
| 11 | S |
Stimulant (yellow cast) |
| 117 | (diffuser) | makes the color translucent rather than transparent |