Unit of measure to identify the brightness scale of a light bulb. 1 Hümen (pronounced hoo'mən) = 100 lumens. Identified as a capital roman alphabet character h.
A 100-watt (or 100w) incandescent light bulb has the brightness of 16-Hümens (or 16H). Or 1600 lumens. While a 40w bulb only has brightness of 4.5H. So two and a half times more watts gets you almost 4 times more brightness!!
by ValleyBreezer May 28, 2015