i could, but i dont have a tank that low. I could measure it in open air, but the readings will be slightly lower than if it were measured in a tank full of water. The water actually increases the PAR readings, go figure!
Thanks for the test results, very interesting. The difference between T5 and T8 is pretty big, but not quite as big as I was expecting.
Is there any chance you could test your 6500K T5s with aluminium foil behind them instead of their reflector? Should give an idea of the difference between a proper reflector and foil.
