JB, I loved your test and in no way was trying to slight it as it was very valuable information in my opinion. I was typing a lot and I should have worded it that in adition to the way you tested I want to do tests through water. so i will do both 24 inch of air and 25 inch (6" air and 18" water) the way I am going to avoid the problems you mention is i am going tu build a special testing cylinder to house the water in so my Apogee meter can be fixed in the bottom. this will be filled with clean tap water or fresh salt mix (I am going to try both to see if there is a difference due to the density difference, if there isn't I will use chlornated tap water for the test). by doing it this way I can rule out all the factors you mentioned.
the whole reason for wanting to do this is I found that the inverse square law doesent work when you add water to the situation. I don't expect large differences but I do expect that some bulbs will penatrate better than others.
Steve
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