Mick, unless you have coral hitch hikers on your
LR there is really no reason to use the lights during the cycle. However, if you are like me, you may want to just look at your box of water and rocks. In that case, I'd turn the lights on for your viewing pleasure and turn them off if you aren't actively looking at the tank. This is should help limit (but not eliminate) the algae bloom that is expected with new tanks.
