Yes, even easier than before, but you must use instant start ballasts. You can even use T8 instant start ballasts to drive T12 bulbs and vice versa. For example, if you have an instant start ballast for two bulbs, connect the two wires for two sockets at one end of the fixture to one socket and disconnect the wire that normally connects at the other end to two bulbs from the unused bulb. The ballast that came with your fixture must be instant start so you can try overdriving one or two bulbs before deciding to buy another ballast.