LED’s quickly made their way into the deep sea and replacing the commonly used halogen lights. Now they are dropping in price and increasing in efficient.

12V, .89W, 87 lum, Lum/Watt: 110
Cost $12, $/Lum 0.12 2015
In 12V, 10A. Out 36V, 3A, 10,000 lum,
83.3 Lum/Watt Cost $84, $/Lum: 0.0084
>80CRI, Color 6000K 2015