They are the minis. The recommended height is 18 inches from bulb to water. Mine are at 11 now so the spread is not as good. I am planning to raise them by making the canopy taller.
I am running 400 watt bulbs. The LBs produce so much par with 400W and that close to the water that I only run each bulb for 4 to 5 hours a day. I run them in shifts with one hour of overlap so all three are never on at the same time. I don't have heat issues that way, but I do have two Icecap fans running.
When I raise the canopy, I expect to need heaters.