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Ok, sorry it's in Russian but for the purpose should do.
Points are:
1. on cars older than 10 yrs, expect voltage drop to the headlight bulb due to multiple old connections to the bulb
2. according to pictures posted and luxmeter data he presents, even 0.5V change already improves luminosity. See last pics - that's 150% improvement over the initial voltage. He went from 12V all the way up to 13.96V. Luminosity went up from 20.1 KLux to 31.4 KLux. He does NOT recommend doing anything for cars that have 12.5V supplied to the bulb.
3. Fix he recommends is this: https://www.amazon.com/Kensun-Conver.../dp/B00FOX5HKG
or whatever it is for your particular headlight. Technically it's a direct bypass harness that connects bulb straight to the battery.
According to the guy, any headlight with voltage below 12V - with engine running - will NOT respond to any bulb upgrades simply because there is not enough voltage supplied to the bulb.
He's some sort of lighting technician at some large car repair center. Has many lighting videos.
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