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Been looking at these here in NZ, primarily for the motorbike. Have treid a few so far (all from aliexpress.com, Chinese direct from manufacturers), so thought I might offer some findings so far... My bike is a BMW with a Bosch Emark headlight, but it's "old" - ribbed "lens" on the glass, not a prismatic reflector.
- all very bright. Bright doesn't mean the road is well lit though!
- most of the designs don't allow for the H4 standard that the low beam reflector/sheild under the low filament is tilted 15 degrees to the left (from the base)
My first attempt uses rectangular LED emitters, so they don't even try to account for the filament placement between high & low. Cutoff pattern was totally lost, so didn't persevere since oncoming glare would be bad.
Second attempt has two disc "COB" LEDs, one up for low & the other down that comes in as well when high is selected. Fitting was excellent (rear "rod" with a removable fan so all the original H4 boot etc fitted) but in operation the beam distribution was more figure 8 and washed out on covering the sidewalk & road edge. Cutoff was good, but needed work to account for the 15deg offset before it sharpened up. Will probably try these on the Toyota Echo here, with a pair maybe the coverage would be good enough (and they're prismatic reflectors, maybe they are more forgiving).
Now have a pair coming with 3 COB disk LEDs ... a triangle of 2 low on top at 45 degrees, 1 high pointing straight down, 2500 lumen claimed. This design has the high beam LED offset backwards (correct, though don't know if 3mm is enough) but the two low beam LEDs **should** get rid of any side-on dead spots, I'm hoping. Will post some photos when its sorted.
HTH
Max
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