Thats a completely different light bar.
If you look either on my site or on ebay. I have the normal M&R light bars and the Elite M&R bars. The M&R light bars have the same amount of LED's per inch as Rigid (40LED in 20" bar and 80LED in 40" bar). The Elites dont because of the reflectors they are housed in
The diffference between them is the projector size. In the Elite model, every led has its own large reflector and a projector lense right in front of every LED. Its assits in better optical distribution of the beam pattern. RESULTS IN LONGER OUTPUT REACH (check pics at end of post) Due to the size of the projectors the Elite 50" only has 60 LEDs, which results in less lumen output. Also the mounts are on the rail system on the bottom of the bar as oppose to sides.
Here is a thing to consider, If you hold up a HID bulb in pitch black place, it will be bright, But if you place it into a reflector housing and install it in a projector lense, you will get the beam further. Thats the best i can explain. If you have questions please ask.
Since its bulkier, I dont think anyone on here would put the The Elite bar on their roof. That is why i dont talk about it much. (check pics at end of post)
Also if you see the ebay link, the 40" Elite has 48*3W LED's while the 40" M&R has 80*3W LEDs. Thats where the difference in lumens comes in
The 6" Elites are the same as 50" but smaller lengths, making them great hood mount lights
Hope this Shows the difference