hay all!

dont fully know if this is the right place to put this but anyways!

i found a high pressure mercury lamp! (150w)

i was wondering what the dif from that to hps and is it any good to use for growing?

the hpm bulbs cost R20.00 ea
the hps bulbs cost R150.00 ea
?!?!?

any info on this would be perfect

Thanks!