This is probably a general LED issue. I'd be curious to see a cold cathode tube of equal size go up against the NovaMatrix led bar. I suspect the cold cathode would win personally.
Speaking as someone who used to install three of them into a 12" x 20" face on 3D slot machines just to get them to almost appear lit (and repair them when the inverters failed), I'll take that bet

Most lighting issues are due to poor light distribution (too close or too far away), poor graphic materials (not properly transmissive / diffusive) and/or trying to light too large an area with too small a light source. One big complaint I have seen on these forums is from people with standard fluorescent marquees in a home setting who think they are
too bright. If your cab is in the same room you watch TV in, it's pretty overpowering, especially if you like to watch in low-light conditions. Most are happy with one NovaMatrix, but sometimes folks will buy a second to give it a little more punch if they have a wide cab.
I also wanted to make it clear that distance is important. While having the light close to the marquee will indeed create a "hot spot" that is brighter, this is at the expense of just about every bit of possible illumination normally achievable with the areas outside of the hot spot. If you look at the picture, in the dark room, the falloff of the light is almost a hard line. This indicates a distance problem. While it's normal to have some falloff at the edges, especially on such a wide cab, this hard edge indicates that the light is too close.
i love your products randy, its just this one isnt up to par imo.
You probably needed two for that cab / material / distance and you would have been able to forget about them afterwards. Don't fault the concept of LED lighting (it's everywhere now) because you don't want to buy enough of them

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I'm not sure what kind of fixture Randy's talking about that needs replacement every 3 to 6 months, but this fixture has been in my cab since the 90's:
The "8$ under the counter fluorescent tube fixtures" that can be purchased at places like Walmart, Home Depot, etc..
I like the compact fluorescent idea. But some folks aren't comfortable with 120v

Make sure you have it well vented as well. They still put off a fair amount of heat in an enclosed box.
RandyT