I have installed a few sets of aftermarket leds and 10-15 sets of hid light kits and hundreds of halogen bulbs in cars and trucks in 20 years of working service shops. I can tell you for sure the led bulbs fit into a stock head light bucket way better than an hid ever thought about. And like I said in my post. As long as they are installed correctly the light beam will be the same. And most of the lights you see in your face are way more likely to be a hid and not a led. Just due to the facts hids have been around for many years and leds are still relitivy new to the market. And hid lights use a high power ballist and leds do not.
Neither LED or HID bulbs should never be put into reflector type headlight housings, they (the reflectors) are designed around the halogen bulb. Due to the placement of the filament in the bulb, if that placement (where the actual light emits from bulb) is moved as little as 1mm it fore or aft (in the reflector housing) scatters the light, same principle as the focus of a camera lens.
There were a few early HID systems that used a reflector housing early Mini Coopers used a reflector with HID bulbs but it was designed as a system not an afterthought.
You said "led bulbs fit into a stock head light bucket way better than an hid ever thought about." So, just because they fit doesn't mean they put the light in the right place...
they don't. Not unless the emitter (led) is in the exact location of where the halogen bulb emits light from. If that is not happening the light emitting from the led gets scattered.
What do you mean "if they're installed correctly"? If the led is seated into housing wouldn't that suffice? or is there something else going on there?
If you take your halogen bulb put it next to your chosen led counterpart and measure from the mounting base to the emitter...if that distance is the same as a halogen bulb that's good and if the lf the led emits light in the right direction back to the reflector it might work. But most I've seen don't meet those 2 qualifiers, hence the scattered (wasted light) we ALL see at night as you're driving down the road. I'm all for new better lighting IF it's done right but so far from what I see on a nightly basis it's just another thoughtless person blinding everyone in sight.
Just one more thing about what you said "And hid lights use a high power ballist and leds do not." So, that's how HID's work the ballast is needed to ignite the gases in the HID, you forgot to mention that in newer cars there's a very good chance you get error codes using leds and have to add resistor or some other counter measure to trick your electrical system to think it doesn't have a lighting problem. It's generally not just plug and play. BTW, I've been around the automotive scene for awhile myself so I'm not new to this either. I know what proper lighting is what works and what doesn't. I'll stick with my stock HID's (which are much too costly) that came with my Alltrack and if I didn't have that I'd retrofit one of the aftermarket headlights I mentioned on my previous post but first I'd try just upgrading the halogen bulb.