Seriously....You are killing me here. I answered you very politely and nicely on the "other forum" on which you tried to stir the pot, and now after that you choose not to reply there but come here and start a post called "Myth Busters"....Really.....why do you not post a disclaimer that you have a horse in this race and that you feel threatened by our product? At least that would be truthful. Here is a blow by blow answer...
The
"manufacture" (they just put their name on it) of this light have made the following claims.
Why try to spin a good thing into a negative thing? I never once claimed that we were the manufacturer, in fact I use the manufacturer's name in my product description. I decided rather than trying to reinvent the wheel, I went to the Number 1 manufacturer in the world of LED's, who have produced LED's for every application imaginable, industry, NASA, Baja 1000 race cars, Mining applications (Ashdown of Australia largest Mining supplier in the world - maybe you have heard of them - distributes them in your neck of the woods), I can go on and on. But why. Their product and housings are amazing and simply indestructible. By "piggy backing" on their knowledge and technology and their power of being able to produce 100 000 units a month, I was not only able to tap into their wealth of knowledge but also their super buying power. I was able to get a price that is unheard of in the scuba industry. An LED head with E/O cord that is far better than a 21 w HID for $349.95. If you add a 4.4amp battery w e/o cord $899.00 for over 5 hours burntime.
It has 4 x 3watt LED's and consumes 10watt ( not too good at math).
As already stated and explained, we - the manufacturer and I, decided to under quote the wattage as there are inefficiencies. That means yes there are 4 x 3 w LED but when tested the "MATH" did not add up to 12w as we are running them at 95%. Basic knowledge uses a formula to calculate watts... P=V/A and V was tested at 13.498v with a draw of 0.8450a which totals 11.40581w. So we decided to slightly underestimate it in the literature to be sure we were covered. This must a first in the industry as most over quote.
As already stated, the 900 LUMEN is the total amount of light produced by the 4 x 3w LED's. That has nothing to do with the "effective light" to the user. The LUX is what determines the "effective" light. On the other forum I included an IsoLux summary report for your review (
http://utdequipment.com/isolux.pdf) and if you were to take the time to compare them against the HID isolux report you would find the LED to be much much more effective.
Now for the underwater design...we had to work very closely with the engineers to develop the proper optic that would give us the "effective" light we wanted, both amount and shape, while underwater. This became a year+ long process of both testing optics and color in a wide variety of water conditions. Remember it is not only what a light meter might tell you in the "hotspot" but also what is useful to the diver, can he/she signal effectively, can he/she highlight the object without burning it out, can the light throw a beam a certain distance through the murk?
Once we settled on a primary LED and a video LED optic that would meet our requirements, then we had to fit it inside that robust tiny housing (Aluminum Cast) that is used in multiple applications. We also needed to find a through-port capable of 180m/600' and include an E/O wet pluggable cord to make it a "system." This system must integrate into our drysuit heating system (Solar) as well as be wet swappable with other LED heads, batteries and so on that we already have in the UTD/DIR legacy. For example, I wanted to be able to shoot video at the end of the line, with the Video Heads, and then swap out the video (60 degree beam) for a Primary Head (10 degree) which could fit in my pocket and then scooter home with a primary making the return home safer and easier to communicate with my team mates. Then when pulling into deco, unplug the light head and plug the battery into my heating port and away we go. Warmth during deco...btw much better deco according to the US Navy tests.
So as you can tell there is a lot more in developing a lighting system for our customer base than just simply "Sticking" my name on an LED head, as you implied.
I hope this answers some of your questions.
Andrew
Marketing is everything you need. 
