Quote:
Originally Posted by Trigger Man
To my suprise I was over at Kwirkys one day picking up a coral and he had just gotten a light meter. We ended up testing the difference between light to water, light with glass cover to water, and light with glass with lots of salt creep and some other guck to water. We thought that the light penetrating the glass that had lots of salt creep and some guck on it woud have a huge difference, but in the end the light readings came in very similar. I was suprised as I used to clean my glass lids covering my tank every day or so, but now I typically just lift my glass at an angle every day so the condesation drips back into the tank and then clean the glass every couple of weeks.
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Were you using a lux meter or a PAR meter for your readings? Sanjay Joshi's test show a PAR reduction of around 10-20% with a pane of tempered glass that is used for DE MH bulbs.