That 48" fixture you posted doesn't have much info about how programmable it really is. False statements like " A reading of 300 par is great but you can still achieve this reading with a 4500k spectrum, which can result in damage to your corals. The right spectrum is what you want and your corals need."
bother me and leave me feeling a bit uneasy about the seller. If they have an excellent fixture they only need to tell us about it.