I think we should start a PAR chart or at least a list of PAR readigs from peoples tanks....maybe it can have the bulb with intensity, K rating, ballast driving it and the reading at top of water, just below water, middle and bottom or your tank;and dont forget to state the depth of your tank. Too bad I dont remember the readings from my 150 Ushio HQI. I know the numbers will change with depth and age of bulbs, but it would be nice to have a glance at chart.....at least I think....anyone with me? So who ever has that nifty PAR meter, from now on, post in here.