which set of lights would be best? 42 w full daylight or 85 w cfl grow

express light bulbs has 42 watt full spectrum 5000k for 9.99 but they have 85 watt cfl grow bulbs for 9.99 also. Could i use a y light adapter for the 85 watt ones and is there really a difference in which one I choose. By the way this will be for vegging. Any help would be appreciated.

Get the 85 watt, more lumens for the same price