17 minutes ago, rotuts said:I do recall the UV lights were very difficult to turn on
manually .
For ballast powered Mercury bulb UV light yes. And if you turn the light off, you have wait 5 to 10 minutes cool off time before they can be turned on again. But there are ones that work like a regular florescent tube, on and off just flip a switch.
UV kills germs in air with 100% coverage.
I don't trust LED UV lights.
dcarch