LEDs May Cause Retinal Toxicity At Occupational Domestic Illuminance

[nograde]

TL;DR: Blue light seems to be the culprit.

Light-Induced Retinal Damage Using Different Light Sources, Protocols and Rat Strains Reveals LED Phototoxicity

 

[Sucrates]

TL;DR: Blue light seems to be the culprit.

Light-Induced Retinal Damage Using Different Light Sources, Protocols and Rat Strains Reveals LED Phototoxicity

I think Ray said this was discovered by Warburg, and separately that it's PUFA dependent. Red light would counteract and to some degree reverse it.
Some studies in Low level laser therapy (LLLT) / photobiomodulation (PBM) / red/NIR phototherapy studies - a comprehensive database by Vladimir Heiskanen