I would provide the same light as will be present after this time. Otherwise, you will wind up acclimating things once, and then again if you change it. I know a lot of people cure live rock in the dark, and I think this is a crazy practice. The thought is to reduce algae, but there will not be any nuisance algae if the water is well managed and herbviores are present. I know when I cure rock, I may wind up doing 2-3 100% water chnages a day until things settle down a bit...I skim heavily, and have even used ammonia blockers to keep levels from becoming toxic to the surviving life. But, that's the very early stages, and probably not what you were referring to...was it?