Halogens are good for illuminating your work area when polishing right? So when you’re polishing you want to be able to see the entire panel.
Now, when it comes to your finishing your hit, you really need something with a lot more power focus in a particular spot. Halogens can hide so much. And I mean a lot. To the point where if you see a detailing post where the only light source used is a halogen light, it probably isn’t too good of a job.
You really need a lot of different light sources to portray the correction. Such as a sun gun, LED lenser Touch, Metal Halide flood lighting fluorescent lights etc.
Halogens deffo have their place in detailing, just not as a sole "check light"
I use them, and will continue too, but you'll probably never see a full correction thread of mine without using a sun gun or metal halide light!