Well we just brought these in and we are very pleased with their light output to price ratio! I have a few lights listed and their lumen ratings and their listed prices for comparison. We did all of this research and that is why we chose them. I am only going to list lights under $200.
H2oLights 6 LED 711 Lumen $99.95
Ocean LED A3 200 Lumens $199.00
Coastal night Lights 380 Lumen $99.00
Coastal Night lights 760 Lumen $190
Now that being said there is no way of knowing if any of these lights are being rated correctly since all the ratings are coming from the manufacturers and not an independent agency. A few things I can tell you about the H2oLights.
1. They come with a driver which has to be installed.
2. The driver is not only a driver but also has built in shutoff circuitry to turn the lights off if the voltage drops below 11 volts which is nice if you forget to turn them off.
3. They have to be submerged they cannot run out of the water like some lights due to the high heat levels caused by the lights.
There are definately better lights on the market, however for the price I dont think you could beat the H2oLights. The best way to settle this discussion would be to get one light from each manufacturer mount them all to some sort of board underwater and go back and forth between them all! I am willing to do the testing if the light companies are willing to supply the lights