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Doo
01-26-2010, 04:08 PM
Thinking of putting a 1/8" (3mm) sheet of Plexiglass over my fixture so that water/ moisture does not get into my fixture or possibly splash on the MH bulbs and crack them?

Anyone else doing this and if so does it eliminate that much of the light going into the tank?

Is there something else that might work better?

Thanks

BlueWorldAquatic
01-26-2010, 04:19 PM
be weary of the heat the MH radiates. I'd be a little concerned.

Ken

ScubaSteve
01-26-2010, 04:35 PM
You'd be better of with a sheet of quartz glass covering the bulbs. It would be affected less by heat and would not impede your light at all (atleast in the spectrum ranges we are concerned with for coral health).

fencer
01-26-2010, 05:21 PM
My old Hamilton ( 2 x 175MH and 2 x 40) had plexiglass on it but the hood had a good vent fan on it. I really depends on the size of the hood because you need space for air flow. There was no problem with the plexiglass

mark
01-26-2010, 05:43 PM
glass on my 250W gets hot enough to burn flesh, I'd been concerned with plastic melting/burning

Doo
01-26-2010, 10:32 PM
A Hamilton is what I have and I have been using 5 mm glass but I think that it is a hint thick

pelle31
01-27-2010, 02:26 AM
I had my 250 on a 33 awhile back. The tank had a plastic brace,and it melted all out of shape.
So when I had a day off I reshaped it using the heat from the 250. I'd be careful.

mark
01-27-2010, 03:04 AM
A Hamilton is what I have and I have been using 5 mm glass but I think that it is a hint thick

my PFO's came with 1/8" (~3mm) glass shields

fencer
01-27-2010, 06:13 AM
The shield I have was from Hamilton..it is 3mm

Doo
01-27-2010, 05:35 PM
The shield I have was from Hamilton..it is 3mm

3mm plexi?

or regular glass?

fencer
01-27-2010, 05:55 PM
plexi...might be 4mm and yes I still have it