How did that work? I thought fluorescence was higher wavelength
No, higher
frequency, i.e. shorter
wavelength.
usually ones we can't see being absorbed and reflected at longer wave lengths.
We can only see the visible spectrum. Both shorter and longer wavelengths — UV and IR, respectively — are invisible to us.
Really hot bulbs do put out some UV especially halogens that need to be behind glass since they are in a quartz envelope to deal with the heat which is clear to UVAB and I think C. But that's less then 1% of the light and the light is like %5 of the total. So almost nothing. Wouldn't the filter have to be purple like woods glass is?
Yes, basically. It's why the incandescent UV bulbs are so unbelievably, insanely inefficient.
Although I have an insane green laser that will fluoresce neon colored paper. That's IR turned to 530nm so no UV, maybe its the brightness on such a small spot?
Not just brightness, just that some pigments/dyes will react to visible spectrum, too. It's probably exactly how fluorescent colors work. (I'm no expert in this.)
As an aside, just an amusing thing a lot of people don't know: in laundry detergents (except for the special ones for black fabrics), they use optical brighteners, which are literally just dyes that fluoresce blue when exposed to UV, making our clothes glow slightly blue, making them appear bright white! (If you have a UV lamp and a box of powder detergent, the specks of optical brightener glow separately, even!)