MAN DONT LISTEN TO THEESE GUYS THEY HAVE NO IDEA WHAT THEY R DOING 2 LIGHT HOLY CRAP THATS HUGE GEEZ PEOPLE GET SOME BALLS IF YOUR GONNA GROW GO BIG OR GO HOME WHY WASTE A BUNCH OF YOUR TIME JUST FOR SOME FREE SMOKE.OK ITHG BASICALLY U CAN PUT AS MANY PLANTS AS U WANT OR ARE COMFORATABLE WITH LEAVE YOURSELF SPACE TO WORK.SO IT KINDA DEPENDS ON THE TYPE SHADES YOUR USING NOW I USE 1000W HPS AND I FIGURE THAT SHOULD TAKE CARE OF AN AREA ABOUT 4 FEET BY SIX FEET SO FIGURE IT OUT IF U NEED MORE HELP POST YOUR QUESTIONS OR SEND EM TO ME AND ILL TRY AND HELP I MYSELF HAVE 18 1000W HPS AND ONE CONVERSION BULB 1000W WITH ABOUT 550 PLANTS AND IN A FEW DAYS WILL BE DOUBLING THAT AMOUNT AND YES THATS IN MY HOUSE SO I HAVE A GOOD UNDERSTANDING ON WHATS GOING ON. THE METHOD PEOPLE CALL IT IS THE SEA OF GREEN METHOD AND FOR ME IT WORKS WELL