I don't know how these might compare to a 7" HELLA H4 halogen conversion in terms of brightness but the Hella sure has a simple mounting and requires no modifications.
I am not interested in the Halo aspect more than its performance.
So question is really useful light on the road and objects on the road.
Comparisons of the lighting can be made in two ways.
1. Passes minimum recognized standards or regulations for headlights. If one meets the standards and the other doesn't, that tells the story. Short version is to look for legit ECE (european commission), DOT or SAE markings on the lens.
2. Measure the light brightness pattern on a screen or roadway.
Lighting professionals use photometric patterns like
these. A less precise way is to set out markers on a roadway and measure the light at the same points with a light meter. It won't show if there is a bunch of stray light, but it will give some indication of how even the pattern is, if its in the right places from the driver's perspective, and how bright it is compared to others tested the same way.
There's a chart about halfway down this page summarizing "Hilldwellers" tests done this way.
http://www.heritech.org/cuda/lightr.htmlIMO your best bang for the buck with 7" round lamps will be GE Nighthawks (sealed beam), Hella Vision Plus (H4), Cibie E-code (H4), listed in order of increasing initial cost.
