So the Kaslight "DOT compliant" bulb has issues. They mounted the low beam emitter too high. It spills light into the bottom of the reflector and creates glare. I do not know how they passed any test if any one looked at the light pattern it created. It could be possible if they only looked at numbers and put sensors only in certain areas. I have seen that done before.....
Another OEM (Miecoo) has an exploded view showing how the LEDs get mounted to one copper PCB and sandwiched inside the heat spreader. This is what gives this type of bulb a superior focus over the previous bubs where two PCB are mounted on a thick heat spreader. This, plus a fully enclosed shield (H4), shape of the leds (like the filament of the halogen bulb) are the attributes that make a better bulb for use on road....
However looking at the location of the low beam emitter relative to the shield on the Miecoo H4 bulb. the emitter is too high above the shield and will spill into the bottom of the reflector and create glare. They too need to move the low beam down 2 mm to work correctly.... (low beam emitter top edge should be on the center line of the bulb....) On the photo here "down" means to the right or closer into the shield...
again look carefully at the H4 halogen bulb above and find the vertical center line, the low beam filament is to the right of that line. look at the led and find the vertical center line (hint: Philips screw) the low beam emitter is left of that line (wrong side) -- reason not to waste your money on this bulb....... now you know what to look for....
Oh, this is the same Issue that the so called Dot compliant bulb by Kaslight had, low beam emitter in the wrong place.....
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So there is one minor flaw with all of these H4 LED bulbs. It should be the next improvement.
It is easy to fix with whatever bulb that you may have. This is a fix that we did almost 2 years ago.
You have to be careful that you do not over do it.
If you put a H4 halogen bulb in a lathe, or drill press, or mill and spin the bulb you will see that the low beam filament is not centered.
you will see that it spins around the top edge of the filament. That is the low beam filament is mounted just below the center line.
This is a detail that is hard to see, and has been missed by many.
by lowering the low beam emitters just a bit will cause the two spots to converge and fill in the dark spot in the middle.
over adjusting will de-focus the high beam. So there is a trade off and you will have to decide which is best for you.
With the G6 I used a bare piece of 12 ga wire, the F2 I am using a bare piece of 18 ga wire.
place a short piece of wire across the bottom two slots of the light housing before installing the ring.
This will tilt the bulb lower to lower the position of the emitters.
As it still stands the F2 is my favorite at 30 watts, very good other options are the M1(25 watts), E1 (fanless), and the old G6 (style) for off road (broader beam) --> F2 for the autobahn (sharp focus to see way down the road)...
It is all about the details.
Maybe, if I repeat the problem three times some one might get the hint there is still an issue.....
