2by2 at most, 65 watts isnt much, never compare a light's wattage against incandesent one. If anyone should be able to see past the marketing bullshit it should be us growers. Always campare it against its toughest competitor, the metal halide, or even other types of florecents. but that 65 will be sufficent to veg a couple of plants though. fourty-five hundred lumens is not much.

payn