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Rumpy Pumpy
06-08-2011, 08:32 AM
Anyone know if shining light through 6mm (quarter inch) thick glass is likely to have a detrimental effect on algae growth?
Rumpy Pumpy
06-10-2011, 11:22 AM
No takers?

I'm just wondering if having a piece of glass between in light source and the screen is likely to significantly reduce the amount of light reaching the screen or alter the spectrum of the light?

I have a 100 litre tank made of 6mm glass which I'm planning to use as a sump/scrubber. I want to have the screen inside the tank, facing out and the light source on the outside, facing in.

Any thoughts?
srusso
06-10-2011, 12:13 PM
I don't have a true answer for you, but glass does have an ability to filter different sections of the UV spectrum. However being that the light needs to be so close to the screen it may not be an issue. Hope someone else can "shine some more light" on the subject.

Google "light penetration through glass" you will get some ideas as to how it works. That logic can then be applied here.
Rumpy Pumpy
06-11-2011, 02:25 AM
I don't have a true answer for you, but glass does have an ability to filter different sections of the UV spectrum. However being that the light needs to be so close to the screen it may not be an issue. Hope someone else can "shine some more light" on the subject.

Google "light penetration through glass" you will get some ideas as to how it works. That logic can then be applied here.


Cheers, I'd already Googled similar but not found anything specific to algae growth.

Just wondered if there was any experience of this on here.

Seems not, so I guess there's only one way to find out.
SantaMonica
06-11-2011, 07:30 AM
Acrylic blocks less light than glass.
Rumpy Pumpy
06-11-2011, 11:02 AM
Acrylic blocks less light than glass.


I know.

But I don't have a nice big acrylic tank to build into a scrubber :(
salty joe
06-11-2011, 07:10 PM
http://buyat.ppg.com/fgbt/welcome.asp

tHIS MIGHT BE A GOOD STARTING POINT.
Rumpy Pumpy
06-12-2011, 05:08 AM
http://buyat.ppg.com/fgbt/welcome.asp

tHIS MIGHT BE A GOOD STARTING POINT.


Many thanks. It appears that there might be quite a substantial (-25% ish ?) effect on the transference of light

If I'm reading these results right?

http://img.villagephotos.com/p/2010-9/1360140/jhdjckh.JPG
salty joe
06-12-2011, 07:24 AM
I don't know, this is dealing with sunlight. Wayne Boor of PPG might be able to tell you what wavelengths 1/4" glass blocks. Please let us know what you learn.


wboor@ppg.com
Rumpy Pumpy
06-14-2011, 01:55 AM
I don't know, this is dealing with sunlight. Wayne Boor of PPG might be able to tell you what wavelengths 1/4" glass blocks. Please let us know what you learn.


wboor@ppg.com


Cheers.