|
PAR is "photosynthetically available radiation", a lot goes into the Available part of that acronym. your par readings could be high closer to the bulb ie higher in the tank with a de, but the lower you go in the tank the par will fall off. 400 watt SE will probably place more PAR lower in the tank IMO i think it would have better penetration through the water collumn. on the other hand depending on the depth of the tank, it could be hard to acclimate corals to the 400 watts in a shallower tank.
|