It’s because headlamp housings are really expensive at like $500-$2,000 for mostly plastic.

So someone just trying to make it easier to see at night cheaps out and spends a fraction for a LED bulb replacement for a few hundies, tops.

You can buy brighter halogens but they burn out much faster.

I personally suggest everyone save up for the housing and do it proper if you’re gonna do anything. At least try replacing your current halogens first because they do dim over time.

Plus halogens melt snow with all that waste heat :)