I use seal beams with relays, but from what I’ve read, reflector units are not good with LEDs. Projector units are preferred. I’ve tried two separate reflector units and with both could not align the LEDs. My LED bulb measured exactly the same distance from the LED diodes to the H4/9003 filaments. So in theory the light should be equally dispersed in the housing. My LEDs diodes are located at 9 and 3 o’clock. I use the seal beams simply because there are no LEDs approved for use in the headlights in the US. They are a modification from factory and not approved per FMVHSS 108. However, their widely in use. Most vendors do post “For off-road use.” Just nearly impossible to aim with reflector units and caused, for me, an irregular cut-off pattern with scattered light. I have projector units, but going to use my seal beams with the relays for now because the lighting isn’t all that bad. Good luck with your project. There are several sites with excellent info on the LED light pattern angles and how they react when hitting the inside of the reflector units.
My stock seal beams (low beam) are 2.73 amps each (35W). H4/9003 are 4.29 amps each (55W). The LEDs are 1.95 amps each (25W). Definitely an advantage with LEDs.
Others here are using them so there’s a lot of useful information.