Well Todd with LYR said i could use them or not, it didnt really change anything with were she slept or woke up on the morning. Some say its to simulate the moon or something but tried it once and it was not that big of a deal so i probably wont do it again.
Some folks like the effect and some don't.
I persnally think its kind of cool if it doesn't bother them in a large cage.
They are on a separate switch for LYR 4 bulb HO t5 Models.....
so one could actually put them on a 4.99 wall mart timer to stay on about an
hour or two after main lights go out
to simulate a "DUSK" and give the animals some TRANSITION TIME to settle in for the night.
I think that is the most sensible use of LED nite lights.
Also:
BIG HINT
You can partially cover/ black them out by coloring over the lens with a black sharpie marker if you (or the critters) think they are too bright!
If you "ooops' and black them out too much with a sharpie marker... then a rubbing alcohol wipe with will clean it right off and you can start over and experiment.
You can also adjust the color to more of a "nocturnal purple" by coloring them over with red sharpie marker.
Or -
since they are on all 4 bulber HO t5 4 bulb models
as a free option.....
I just get them made that way and have them made special on a separate cord & switch......
so.......
naturally you do not
have to use them and can turn them off. (unlike reef tank blue lights on all the time.)
But my recommendation is to have them on a timer and run an hour after lights out to give the animals transition time. (Dusk)
The sun doesn't just "snap" off outside.
The goal is to create the best environment possible for our animals.

Onward and upward!
Cheers!
Thank you,
Todd