reflectors

rizzzla · Sep 30, 2002

i need to build two reflectors...

1 for a 150w hps

another for a 400w hps

i think i will use anodized aluminium, but is there a particular shape i should do or something i should know before starting

thanks

mcurry · Oct 2, 2002

Originally posted by arseface
Hmm... building reflectors... not a great idea. Certainly for the 400W, I think you should look into buying them.

That said, here are a few pointers.

You must avoid 'hotspots'. If you use a clean, flat piece of metal, then small deformations can create hotspots, much like a magnifying glass on a sunny day. You can do this by having 'lumpy' metal, which scatters the light. Do this by bashing lumps into the metal, but make sure the 'lumps' point outwards towards the plant, or light will bounce around in the dimples before it escapes, losing some efficiency.

Also, you might think of creating a reflector, and then covering it in mylar (comes in sheets). Mylar has excellent reflective properties (~97% reflection, I think...), and is better than aluminium.

All this said, I'd strongly advise you to just buy a reflector for the 400W HPS. They're not that expensive, and are designed to give very good, and relatively even light distribution.
Click to expand...

I agree completely.
Buy one!

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