I'd be returning things to normal. In all reality, the clown eggs are cool...until you realize that they are fancy food for your tank inhabitants. It takes a separate setup to try and raise them. So, I wouldn't make special accommodations for them considering that.
When it comes to the anemone splitting, this is normally a response to stress as Todd stated. I wouldn't look to it as being directly from the light, but combine that in with the clowns being in and around it with the eggs can also irritate an anemone. As long as there wasn't any drastic changes in the tank I would put the lighting back to normal and continue on like normal.