My $.02.
The SIP Vape DC is exceptional.
Would not build another motor without.
Brake light is equally important to me - and it is just wow bright when I step on the peddle.
Other riders have noted both tail and headlamp when I have ridden in groups (I had forgotten all about it).
The Amazon LED that I plugged in to the existing headlamp base worked ok - but had two significant drawbacks that limited.
1. The aim - was too high - though the light pattern was decent as the bulb I put in had the hooded reflector and placement near where a filament bulb would have sat.
2. They dont last. Too much vibration - literally fell in to pieces.
So I went back to the drawing board.
Couldn't swallow the $200 version from SIP.
Also - if honest - not really a fan of the look.
Since I am on a VBB - I think I am also about 12MM or so smaller than the 70's bikes round headlamps. I found this one using "passing light" as my search - which was the highest lumen in this style (both amazon and aliexpress offer).
https://www.amazon.com/gp/product/B07C7CJW8P/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
It was about $45 on Amazon and available within 1 day (about half the price on aliexpress but longer wait...) and it came as a set of two so I have a spare.
I love this light for the price.
The good:
it is a non reflector - and ~3400 lumen.
It has a pattern that is like a half moon - and I found that if I run it 180° from intended - it has a hard line across the top like modern car lights - so I can set it just below the level of an automobiles side mirrors and know that I am not bothering them.
It is rock solid. Never flickers, and doesn't mind a ton of vibration.
The Daylight Running Light looks cool - and I often run with just that until its dark out.
I also like the fashion of it - techy but not weird - to my eye.
The compromise:
The light output is probably not as long a throw as the $200 SIP one - as it is likely wider but less long in its pattern.
I used 3 pan head Allen bolts in stainless in varying lengths and tapped the top hole in my headset that used to be just for a tab.
I drilled a hole in the bezel to match - and that allowed the three bolts to triangulate and hold the light in. By varying which one I tighten first - and then shortening or lengthening the top one - I was able to make those bolt then adjust its aim.
Net result - I have an amiable light - that does not rattle or move - and is about 15x brighter than my old incandescent bulb. It projects a wide half moon shape with a hard line across the top - and riding at night is a totally better experience. Probably not quite as good as SIP.
One last thought. Aliexpress had a number of lights that were slightly larger - and would have matched SIP. I just couldn't use them as my headset would not hold. You may want to measure your opening carefully to see if they fit yours.
-CM
I added the bolt at the top fo the bezel to give me the triangulated hold and just screwed it until it interfered with the light housing which is hard ABS. There are three bolts in total to hold it still.