depends what u have
but for u a 40 watt single bulb will do .....LOL
I like the 4 bulb tek light ,,,,I have a 8 bulb over one of the frag tanks and i have a 6 bulb on 2 others and a 96 watt PC over another ,,,So it all depends what u have
Sorry Jer but ill tell u the rest when u stop by
I got a INFRACTION ( DEMERIT) for offering .....