Walmart carries a good waterproof flashlight (Duracell brand I think) that takes C cell batteries and is green - we've carried one of these for the last three years on the Tybee 500. We also carry a combination strobe / flashlight on the shoulder of our life vests but I can't think of a single night sail that we turned them on...it absolutely destroys your night vision. A small LED head lamp with a red filter will work pretty well if you need to see a chart or something from time to time.