WetBoy101
Contributor
Just about any small back up light will do the trick. I dive with a light regardless of it being day or night. Mostly the day dives it is a just in case light or for, like you want to do, look in holes. I use a Light Monkey 3C Rat. I love it. It is well built and bright. I also like how reliable it is. Being a twist on, it is less likely to be turned on accidentally when you do not need it, either blinding your buddy or running down the batteries.
I have to disagree!! You should have a "narrow beam" for daytime diving. I have three Intova lights that I use for diving. The Ultra Nova for daytime. (220 lumen) The Super Nova for night dives (500 lumen) and the Mini (220 lumen) as a back up for night dives. The 500 lumen wider beam doesn't work half as well as the narrow beam 220 during the day. Just sayin!!!