The best-performing 7" LED headlamp is the excellent JW Speaker 8700 Evolution 2, which is available in
black or
chrome. It is designed and manufactured in the United States, and meets both the US and the UN ("ECE", "European") photometric standards -- though any individual example will have only US or UN markings on it. This lamp is available with built-in front position ("parking") and daytime running light functions, but those variants are harder to find from North American vendors; you may have to contact Speaker directly.
The
Truck-Lite units, also designed and manufactured in the USA, are objectively very good, but their beam pattern (in the US version) is very "choppy", that is, it has a lot of artifacts: streaks and spots of light in the beam. These can be distracting on the road under some circumstances. The GE and Philips LED units are rebranded Truck-Lites, functionally identical to the Truck-Lite branded product. So far, the rebrands seem to be listed at higher prices than the Truck-Lite branded lamps. There are UN ("European") versions of the Truck-Lite lamp available for left- or for right-hand traffic. These have a much smoother beam pattern than the US lamp, but low beam peak intensity is not as high as with the US lamp.
The
Peterson headlamp, also American-designed and made, is a good one. Its beam is smoother than that of the Truck-Lite. Low beam peak intensity is not as high as the Truck-Lite, but the Peterson high-intensity zone is wider. Neither way is overall better; they are two companies' choices in how to optimize low beam performance for the driver. This lamp is also sold as the Sylvania Zevo and the KC HiLites lamp.
The Quadratec (which they falsely claim to be an "exclusive" of theirs) and the Grote are an offshore import; a rebranded Maxxima that is several significant steps below the three above. From there we continue going downhill with "Nolden" (a German rebrand of a Taiwanese lamp made by a dubious company called Microlight), Dialight (a truly pathetic item in terms of beam performance and formation), Hamsar (ditto), Optronics (ditto) and assorted own-design or knockoff lamps from a myriad of companies in China.