Well--I am not sure.
But I thought that would get a few peoples' attention.
I cannot figure why Mh bulbs(250 watt) at 16000 lumens at 8" from the water surface are preferred over vho at 3500(110 watt) lumens at 3" over the water surface.
Given that light from a point deliveres energy at the reciprocal of the distance squared, why would one prefer MH at the distances given above? DO I have wrong data?
This one is not an experience or opinion question folks. Just looking for what I must be missing in the physics department.
And I know I am talking about photometric measurements. Lets keep it at that for now, and worry about the radiometric measurements later.
b.
But I thought that would get a few peoples' attention.
I cannot figure why Mh bulbs(250 watt) at 16000 lumens at 8" from the water surface are preferred over vho at 3500(110 watt) lumens at 3" over the water surface.
Given that light from a point deliveres energy at the reciprocal of the distance squared, why would one prefer MH at the distances given above? DO I have wrong data?
This one is not an experience or opinion question folks. Just looking for what I must be missing in the physics department.
And I know I am talking about photometric measurements. Lets keep it at that for now, and worry about the radiometric measurements later.
b.