No. She says :The black are in the blue spectrum. She's simply saying use the reptile heat lights and not the party lights..... not saying don't use black.
Real black lights are of two kinds; BLB flourescents "party lights" or "poster lights" that cause eye damage and secondly; BL which are safe for providing UVA and UVB safely in the day but are unnecessary as you need bright white light to promote basking. She says never use UV at all at night.
There are a third type , an incandescent black ''poster' light used for Halloween.
Then a fourth, "black phosphor" that are not dark enough.
The fifth type of night light is the nocturnal reptile incandescent light in red, blue, or green.
Blue :
Call it black if you like, but i wouldn't use one, myself. I still feel it's better to have natural darkness, for me just a little light through the window.
If you do want blue light, that's perfectly fine.