RE: [AGA Member] Fluorescent Reflectors efficiency--reflector study article

["Gomer" <iegomer@hotmail.com>]

1)  they are scrap reflective pieces of patierial that are sitting on an
angle of ~ 60° on the open end of the reflector.
2) I understand it isn?t a point source, but that was the best approximation
that could be made without having to spend days upon days with mathematica
to model the proper flux.
3)I don't remember what the aperature or shutter speeds are, but I can tell
you that every photo was done with identical settings.   Perhaps you can
compare the %increase between each image using the first (no reflector) as a
basis.  I'm not sure how to do that with an image though.

Glad you enjoyed :)

-_Tony



-----Original Message-----
From: owner-aga-member@thekrib.com [mailto:owner-aga-member@thekrib.com] On
Behalf Of Steve Pushak
Sent: Monday, April 12, 2004 4:36 AM
To: aga-member@thekrib.com
Subject: RE: [AGA Member] Fluorescent Reflectors efficiency--reflector study
article

A couple of comments:

1) what are "side panels"? Are these reflectors placed at the axial ends
of the bulbs?

2) your diagram shows light being emitted from the bulb radially from
the centre of the bulb; it does not. It is emitted diffusely from the
phosphor coating on the inside of the glass. To further reduce restrike,
the area directly above the bulb should be angled more; deepen the V.
Its not going to make a big difference, perhaps 1-2% improvement in
efficiency.

3) do you have any quantitative measures such as exposure/aperture
ratings from an automatic SLR camera? If we had these, and knowing how
absorptive your black backdrop material was, we could estimate the
efficiency of the reflector measured as a percentage of the rated lumens
of the bulb directed into the tank. 40% seems to be "typical" based upon
the limited data I have seen.

Thank you for your information!

Steve P

> -----Original Message-----
> From: owner-aga-member@thekrib.com
> [mailto:owner-aga-member@thekrib.com]On Behalf Of Gomer
> Sent: April 10, 2004 9:40 AM
> To: aga-member@thekrib.com
> Subject: RE: [AGA Member] Fluorescent Reflectors efficiency--reflector
> study article
>
>
> I did a reflector study a while ago with some nice visuals.
> You might find it interesting
>
> http://www.aquaticplantcentral.com/forum/cms_view_article.php?aid=16
>
> -_Tony

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