I changed mine, throughout the day. I used an Apex and later a Profilux controller, both with the ability to automate the intensity and mode. I would run NTM throughout the photo period and Lagoon during lights out. I would also very the intensity, growing from "dawn" through "midday" and then back down again to "dusk" and then back to lagoon mode. Tank did very well IMO.
Without a controller, you can manually turn the intensity down at bedtime, and then back up in the AM.