@First grow 77710 --- Figure it this way:
Five "Burple*" lights = about 500 watts, give or take.
--Look on the label - some of them have their true power on the label.
IMHO, 500w is a bit low for a 3' X 5' space. 33W / Sq ft. Still workable, you might be a little fluffier than you'd like at...