I have looked high and low and there has been no "real testing". Certainly not on Youtube (or it has been hidden really well or not indexed). And Googling comes up with some comparisons but nothing current where the products we care about are looked at side by side.
Real testing would be side by side or duplicate drive testing with still cameras or DV's with locked white balance, same conditions, etc. It would compare the best product from each manufacturer or products in the same price range or products with similar element count or wattage or length, or function/use, etc.
Ideally I'd just like to see the light bars that are used on the current ADD and SDHQ bumpers honestly compared.
So as far as I can tell we're talking about:
40" Vision X Reflex LED bar (22 10 watt LEDs total, mix of 4-35 degree LEDs on the edges and 18-10 degree LEDs in the middle positions) List $1600 ?
39" Vision X Evo Prime LED bar (24 10 watt LEDs total, mix of 4-40 degree LEDs on the edges and 20-20 degree LEDs in the middle positions) List $1970 ?
40" Rigid "E" Series LED bar (80 LEDs total, 195 watts total, LEDs are grouped in sets of 4. outside 4" on each side are flood pattern, inside 32" are pencil beam) List $1300 ?
The Rigid bars are cool as with the higher number of elements they really fill the enclosures edge to edge. The Vision X look more like a collection of round lights. Not sure I like it as much. Superior performance would certainly tip the scales.
Here are a couple differences between the above bars you mentioned...
Both the above Vision bars are running with newer technology 10 watt leds, not the 3 watt style that are in the earlier Vision X bars or the current Rigid bars.
The newer Evo Prime has an integrated electronic thermal management unit. This allows the 10 watt led to be driven at a higher efficiency which means more lumens output.
Also we can modify either of the bars to have what ever combo of led's you want (ie. 20 & 40 degree on the Evo Prime and 10 & 35 degree on the Reflex)
Here is a shot of the Reflex & Evo Prime..
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