4 times 30 is 120. But that's ok. Are those warm white or daylight light bulbs. The daylight (6500K or Blue) is better for vegging the plant. The warm white (2700k or 3000k - Red) You have 4 lights, 3 should be blue and 1 red. They won't need nutes for a coupla weeks or so.
Good Luck with your grow tho!