How far will my 150w hps penetrate?

Hey everybody, I am wondering if I would be able to sustain a tall grow with only one 150w hps light? Would I be okay if I added some side cfls? Please help

i would definetely add some cfl's on the lower buds. i dont have a figure on how far it penetrates, but i have used 150's before and cfls would definetly help. how many plants are you hoping to grow? I wouldnt throw more than 2 or 3 under there if you want good usage of the light.

here ya go...

http://hightimes.com/grow/nico/4968