How can you tell that this one doesn't give off uvb?
Hi Casperr...
Incandecent bulbs do give off some UV A Rays.
(UV A rays are like "black light" rays that make flo. posters glow and "DNA" on CSI "glow".)
But the bulb you are talking to just does not / can not produce UV B because it doesn't have the right substances in it.
It only has a tungsten filament.
To generate UV Rays, you need the bulb to contain mercury vapor gas (In Mercury Vapor bulbs) or mercury in Flo. tubes (like Arcadia's UV bulbs) that ignite at a high enough temperatures to them emit UV B ( and UV C*) rays.
* but you don't want ANY UVC. .. so that is why one must stick to only quality, tested UV bulbs.
The "cheapie" Chinese bulbs and those stupid "e-bay" reptile UV crap can harm, kill or blind your animals.
You see..... in
quality UV bulbs, IT IS THE GLASS THAT IS THE KEY!
Because glass of the right composition will filter out the "bad" non -terrestrial UV C and Ulra Low UV B.
And the cheapie make a buck quick bulbs (that are just UV CURING BULBS used in curing paints and things) are the ones that unscrupulous people buy and sell to prey on the ignorance of hobbyists.
And they can have hit or miss results because the glass is not formulated to filter out the bad rays.
So they "may" work without blinding the animals
IF, by chance the batches of glass used to make them just happen to contain enough traces of iron and minerals to filter down the bad UV rays. (without blocking all the good rays).
Or these industrial curing bulbs may block nothing....
showering your animal with ultra burning, cell damaging sterilizing UV C rays.
The same rays that normally get filtered out here on earth 100% by the Earths ozone layer.
anyway,
sorry...
I have gone off on another UV Tangent...

LOL
but I can't help it.

I am so passionate about
providing this hobby the RIGHT LIGHT.
The right light makes ALL the difference in the health and lives of the animals. Absolutely no doubt about it.
Cheers and happy Memorial Day weekend to all.
Todd