So are you trying to say light coming out of a round tube flourescent bulb directs the light ONLY in one direction? Down? So if I look at the side of the bulb there's no light coming out? Interesting. How do you know which way is right side up before you turn it on? You wouldn't want the light shing up only. On every flourescent bulb I've ever seen, the light comes out from all 360 degrees. Some reef bulbs have a reflective coating over the top half to reflect more light down, but it still comes from the sides too.
And your diagram shows a mh
doesn't shine directly down? I must have special bulbs then, cause mine sure do shine down, and up, and sideways..in fact light comes out of a round, horizontally mounted mh
bulb from all 360 degrees.
Forget your angle theory
It's all about the intensity.