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Old 01/03/2008, 08:56 PM
Fiziksgeek Fiziksgeek is offline
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Join Date: Jun 2005
Location: Tariffville, CT
Posts: 1,224
Re: SWAGing PAR differences between bulbs with math.

I believe this would be true if you assume a point source in space with no attenuation or reflection. This is obviously very far from what we have!


Also, I was told that main display at Greenwich Aquaria uses HQI ballast to drive the snot out of the radiums. I am curious as to why they don't use better reflectors too...for a store in a high end market like Greenwich, you'd think they wouldnt cheap out there. Oh yeah, I also thought the tank was only 34" deep, haha.

Wish mine looked as good no matter what they do...



Quote:
Originally posted by JPMagyar
Intuitively I am assuming that PAR from a MH will drop off in proportion to the square of the radius
So the question is: Should PAR drop in proportion to the square of the radius and is that radius properly measured in meters and how do I convert that to a chart estimating the percentage reduction in PAR?