The light over the clams is an Aqua Medic 250 watt MH pendant
http://www.aqua-medic.com/oceanlight_pendant.shtml
I bought that brand because of price, styling, and since it did not have actinics which are not needed for clams. I got it at Wai's in Calgary. I think Big Al's carries that brand if you are looking for a West Coast dealer.