" 50microwatts/cm2 would equal to 500mW (0.5W)/m2, that is a good irradiance for UVB"

Wait, what!?
Now I'm truly bumfuzzled.

.5W = Half a Watt = 500 mw
.05W
.005W
.0005W
.00005W = 50 MicroWatts = .05 mw

How will .00005W per square centimeter become a half a Watt per square meter.
Where does the extra energy come from?
This make no sense to me.

What am I missing?

Aloha.
Puzzled lizard brain.
Weezard Reviewed by Weezard on . UVb an experiment Quick background: I have been using UVb supplemental lighting for many years now and have always thought it added to the finished product in a couple of ways. I had never promoted it's use on these boards because I felt it was dangerous and had real potential to harm people. That changed a few months back on the other UVb thread, and I came out of the closet in strong support of it's use. Well some here who's opinion I respect (like Weezard) held the opposite view and those discussions led me Rating: 5