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Not sure what you had in mind without spending money.
All I can think of is check voltage at the bulb. If low voltage fix the issue but even that is likely to cost some money.
Backup lights like all of your exterior lighting is regulated by law. If I recall back up lights are limited to 260 lumens or somewhere in that area. LED backup lights are not an upgrade to actual light output, they are an upgrade to longevity and cost significantly more money.
You could add some flushmount LED bars to the bumper w/o spending a ton. I was thinking of some like this one for myself (all over ebay, etc). Something like this is a 60deg flood, 800 lumens per 1 fixture. Adding 1 per side on the bumper would gain you +1600 lumens. Or more work but nicer look would be something flushmount.
Lumen limits? Never heard of anyone getting a ticket for backup lamps...? But stranger things have happened I suppose.
I've used these personally in my Expedition. They made a huge difference. The reason is because these have a direct rear facing led under a lens in addition to surrounding led's that get reflected back. Because of the lens, they are a bit longer than the regular bulb. They fit fine in my Expedition and I know people that have them in their F250's. I'm going to order another set for my Excursion now. Wow the price has really come down also. Two years ago I paid $25 or $30 for a pair. Now they are $7!
I've used these personally in my Expedition. They made a huge difference. The reason is because these have a direct rear facing led under a lens in addition to surrounding led's that get reflected back. Because of the lens, they are a bit longer than the regular bulb. They fit fine in my Expedition and I know people that have them in their F250's. I'm going to order another set for my Excursion now. Wow the price has really come down also. Two years ago I paid $25 or $30 for a pair. Now they are $7!
As you can see, the bulb needed is a 3156 which is the same type as the Amazon linked LED bulb. The "only" problem is that this bulb is a tiny bit longer than a standard 3156. So it may not fit behind all lenses. The base is correct.
There are no limits on lumens for backup lamps in Texas. I don't know about other states, but I have never heard of this "limit on lumens" in 17 years of writing tickets