I calibrated mine -- there's a little calibration screw on the back labeled with "Gamma, X-ray, UV, Visible, IR, Microwave, UHF, VHF, HF, ELF" It's only got ab

I calibrated mine -- there's a little calibration screw on the back labeled with "Gamma, X-ray, UV, Visible, IR, Microwave, UHF, VHF, HF, ELF" It's only got about 120 degrees of rotation, so it's tricky trying to tune it to emit a particular color. I had it turned to ELF for a while, but then the Navy called and said my flashlight was disrupting their submarine communications.