i have had BlueWaterLEDS on my boat for the last 2 years hear lately i have done a few upgrades on my system as well installing new one on my friends boats anyways the reason for this post,in had a conversation with Jeff at BlueWaterLED on 5-16-12 in talking he asked did i check my LEDS before install which i said yes i always do he said all you need is to check with a 9volt battery!!!well after hanging up the phone i got to thinking 9volts lets see so i took 2 30LED/20icnch strip lights and hooked them to a single 9volt battery!!!GUYS these things burn for over 8hrs on 1 9volt battery and i can honestly say i could not tell any difference between first hooking them up and turning off they was just as bright!!!!way to go BLUEWATERLED!!!!Thumbs Up