more light......... you have a 2 x 4 x 6 ft area and a 150 watts...for your area to get the proper lumens per sq ft I would be under 400 watter and enclose your growing area to contain the light.....try some mylar tapped to cardboard....square off your area

When I grew in a closet it was 3ft x 6ft x 6 ft I use 2 -400s and it procuded nicely...2500 lumens per sq ft and up produce nice gardens