I ordered one about a year ago and forgot all about it. After a few apologies for the lateness of the shipping, the order never arrived. This comment reminded me, so I just emailed them to see what's up.
I also bought these and I used them twice and then have forgotten all about them until right now. I'll have to put a reminder to start using them again, it's only 3 minutes once a week.
How long have you been using it? Have you noticed any effects?
Only for a few weeks. No obvious effects yet.
They are 670nm which is close to this study (650nm?)
Yeah I also bought a "photo red" 665nm 1W diode after that last thread, stared at it occasionally at low power and never noticed any difference. I guess it's one of those things you gotta do for several decades and unless you leave one eye as a control there's nothing to compare to anyway.