Each of the NOCQUA light systems have a different “lumen” rating – a lumen is the technical unit for measuring brightness. One lumen is the described as the amount of light produced by one birthday candle, one foot away.At NOCQUA, we like to use the lumens as a simple way to differentiate between our light systems, but the unit only really tells part of the story. We also like to talk about the “light penetration” of each light system. All three of those elements – water clarity, lumen rating, and light penetration – account for the desired effect while out on the water. While deciding on which system will suit your needs the best, think about how you want to use the NOCQUA light system, where you’ll be using it, and how bright it needs to be. If you have any further questions, please email info@nocqua.com. We’ll be happy to help you narrow down the search