re: bulbs "cheek-to-jowl"/ Mylar sources
> From: "A. Inniss" <andrewi at u_washington.edu>
> Date: Wed, 19 Feb 1997 23:54:06 -0800 (PST)
> At what distance apart do we stop having a significant lumen
It depends entirely on the shape of the reflector. Make a scale
drawing of the cross-section of your light setup. Draw radial lines
from the center of each bulb. Where a radial line hits the reflector,
draw a line leaving it at the same but opposite angle. Where does the
line go? If it does not go to the water, it's not adding much to the
> My bulbs are 1/2 inch apart: is that close enough to significantly
> reduce lumen output?
I think so.
> If so, I had the idea of putting some thin strips of tin between them,
> which i think will also help direct the light downward, right?
Do a drawing.