Some Partsam lights do indeed state they are DOT approved. Some don't. They might be DOT approved but they might not be if they don't specifically state they are.the partsam lights i bought have the DOT stamp on them?
another common light manufacturer is GROTE
I'd go so far as to say that if you're changing out all your exterior lamps go with something that has been around for a long time and is available in just about any truck stop. If you want LED just swap out the bulbs with LED ones.I think it's wise to stick with lights common as OEM items on school buses... Trucklite, Sound-Off, Weldon, etc. They're reasonably priced, DOT approved, generally well-built, and in most cases getting just parts (gaskets / lenses / bases / etc) is just as easy as new light assemblies. Most 'Amazon' lights are essentially throw-aways, and you never know if what you bought today will be around tomorrow. We bought spare lenses, gaskets, & bulbs for all our markers... a failure/breakage is always 30-seconds away from being fixed.
Some times the cruise control will quit when you convert the brake lights to LED.