jln pasar lighting shop. or the light tubes n equipments supplier in SS2. same row with gloriajean coffee. selling those china brand MH casing, ballast n bulb. Price is around RM250 for 150W n 10000K. if 70W...shd be cheaper. try to get 8000K. 10000K is a bit higher.

i m using 150W 10000K. too bright. heat will generated the temp up to 35-40C. (I was once forgotten to turn on the chiller.)