I think you can't make a decent LED streetlight and there is no need to. A sea of patents and most of us would get fired because we couldn't achieve the cost target designing for a (real) 10-year service life.
There's also the "race to the bottom". Here's what you get for
under $1 (4.5¥) in china. Yes it burned my fingers (50W version) and
BigClive measured 126°C temperature on his "100W" version.
I got one just to hang on the wall and remind me that engineering quality products means absolutely nothing now.
The vendor admitted they hate selling them, they are cheap even by chinese standards. But a certain third-world country loves buying them, so they make them. I could never get the aluminium reflector or IC alone for $1, let alone the MCORE pcb or LEDs, bubble packaging, silicone gel, instruction sheet, or assembly. The low cost is stunning.
If you're looking at streetlight bids and tenders, a low price is going to be very attractive and a 10-year warranty... of course the company will shut down in a few years to absolve any liability.
Just like the crappy condo developers and builders. Make a junky building, shutdown the company afterwards and there is nobody to go after when structural/water issues arise years later.
Meanwhile, it all paid for a Lamborgini or two and exec's are enjoying a ride in the sun.