It's not the fixture it's the LED you install in it. The best and brightest LED I've seen for this service is the Starlights Revolution line. Install one of these with an Amber lens and you will have no more complaints.
As much as I like my Starlights fixture, I would recommend you look at the
RV LED Lites fixtures. Greg Wilson started Starlites many years ago and designed all their fixtures and most of the purpose built LEDs like the Revolution. He sold the company a few years ago and started
RV LED Lites and has continued on with a whole new line of products including improved external fixtures. I'm sure he'll be in Quartzsite again this year if you want to go listen to him talk about his products. Greg is a design engineer not just a resale vendor. This is HIS stuff..