On: Removing yellow stains from fabric with blue light

[delfinom]

Buy some diy flashlight kit. There's an entire community of people that build flashlights for fun and hence a ecosystem of parts.

Then put in the strongest 455mm wavelength diode you can find off Digikey that fits the kit parts.

[kragen → delfinom]

Haha, 455mm! That's 659MHz, which used to be channel 45 for UHF TVs in the US: https://en.m.wikipedia.org/wiki/Television_channel_frequenci... but has it been reallocated to something else like LTE?

https://www.spectrumwiki.com/wiki/display.aspx?f=659000000&l...

[unwind → delfinom]

*nm, as in nanometers.