Call Hydro Innovations (the manufacturer) they have GREAT tech support. I'm certain they will recommend 1 icebox per 1000w light and atleast a 1/4 HP per 1000w light (for a total of 1/2HP chiller). You should get the following if you want it to work:
(1) 1/2 HP chiller (Chillking preferably, Ecoplus & ActiveAqua work also)
(2) 8" Air cooled reflectors (8" works better than 6")
(2) 8" Icebox
(1) Box 8" duct
(1) Inline Fan (MaxFAN Preferably but ActiveAir, Ecoplus, Vortex, CAN etc work)
(1) 55-75G resevior
(1) Pump (1264-2240GPH)
(1) 1/2" hose 25'
PM me, I can steer you in the right direction to get the stuff cheap. Hope this helps!