Re: [APD] HQI's

[Gordon McLellan <gordonthree at gmail_com>]

optically transparent and uv absorbing ... isn't that a contradiction :-)

for optimal transmission of the visible spectrum, you're going to want
something THIN ... but thin also lets more UV through. consider a square
"tube" made of wood with a thin safety glass 'bottom' to let the light out -
glass is pretty dense, it should absorb most of your UV

alternately, US plastic (www.usplastic.com <http://www.usplastic.com>) has
3" or 4" clear PVC - but it's not clear like a polycarbonate tube would be.

ahh ... I did find a clear polycarbonate tube here, 3" but darn its
expensive

http://www.tapplastics.com/shop/product.php?pid=276&;

making a wild assumption, the polycarbonate lenses of my safety glasses
claim to stop 99% UV, so, that tube should stop uv as well?

how about taking a sheet of plexi and using a heatgun and something long and
round and cheap (like aluminum ducting), cook the plexi until it takes the
shape of the duct


Gordon

On 9/29/05, Jerry Baker <jerry at bakerweb_biz> wrote:
>
> Tom Wood wrote:
> > According to this site:
> >
> > http://www.hellolights.com/
> >
> > HQI lamps "MUST" be used behind a piece of glass to filter out UV. I
> looked
> > at these as a way to sneak in a noontime boost with my PCs because the
> HQIs
> > are so small. But they are small because they don't include the glass
> > shield that comes integral with the mogul screw-in lamps.
>
> I thought about mounting them into a regular reflector, but inside of a
> UV-absorbing tube. I figured I could make the tube into a wind pipe for
> cooling with exhaust out the back of the canopy. Then it seemed like a
> lot of work. I might still do that though. I don't know where to buy
> optically transparent, UV-absorbing 3" or 4" tube though.
>
> --
> Jerry Baker
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