Yes they are worth it Ive had myn for about 2 years it helps the fish to not get disoreinted & helps them not to run in to stuff so they can sleep better and there less likely to chase each other & Its more natrual its said to help with reproduction so on, When you go Scuba diveing at night its supriseingley bright from the moon light you can see under water just fine its 1 of the best times to dive because every thing comes out at night. I only no this because Im a diver...