How many plant

How many plants can I put under a prosource jumbo 180 watt

Depends how big the certain strain of plants you're growing gets, and how big you let them get in their veg stage. There is no uniform size among all marijuana plant strains.

Probably no more than 2 if you want max results. Don't have a pro source 180 but do have a pro grow 180 from hydroponics hut. Two "average" size plants will do very well under mine. I'm assuming they are similar in that pro source and hydro hut are both higher end led companies. Bad Karma grows with pro source leds. Find him on the LED growing is the way of the future thread and chat him up.