Tough subject to cover.
Headlights have national minimum performance standards plus some old regulations that prohibited "better" lighting... those are mostly gone now but it is not "anything goes". The projected pattern is regulated and only approved tested headlights are legal on the road. As far as I can find out, NO bulb except a standard halogen H4 bulb (or any other replaceable bulb like a 9008) is road legal - xenon, HID, LED... all prohibited in reflectors designed for the halogen H4 or other.
Not that this matters if the pattern and light achieved is good, enforcement is nonexistent. However if your illegal headlight blinds an oncoming driver and causes a crash, life may get complicated for you ... legal, health, or both. Or death.
Comparing lights via pictures is not so easy. Cameras adjust exposure for the light level.
Pics from the rear won't show the luminance out the side of a tail light, this is an issue with the LED tail bulbs that are directional towards the rear.
And when I looked into LED tail/brake bulbs the only ones bright enough from the rear were directional with low side light. The ones with multiple LEDs facing sideways were all pathetically dim. These may have improved since I did my tests about 10 years ago. COB and other LED technology has evolved a lot since then.
Do not use a white LED for signal or brake lights. Use ones in the lens colors. White LEDs are all actually deep blue LEDs with a yellow phosphor coating. The light looks white from the mix of the blue LED and yellow phosphor light (yellow is a mix of red and green). All these (unpowered) white LED chips look yellow since you see the phosphor coating. Filtering out red or amber in a lens loses a lot of the actual light.
For the nitpickers: Yes there are 3 color (RGB) multichip leds that can be controlled to be any color including white but the bright white ones are all phosphor type.