How should I compare Solar LED Street Light Manufacturers in India?

I am looking at different solar LED street lighting options and would like to understand how experienced buyers compare manufacturers.
When searching for a Solar LED Street Light Manufacturer in India, it is easy to compare products based on wattage and price, but I suspect there are several other factors that are equally important.
For example:
LED efficiency
Solar panel capacity
Battery type and capacity
Lighting duration
Charging time
Controller performance
Weather protection
Mounting arrangement
Warranty
Installation and service support
For larger projects, would you recommend testing a sample unit before ordering in bulk?
I would also like to understand whether All-in-One systems are generally easier to install than Semi-Integrated systems, and where each type is normally used.
Any practical experience with solar LED street lighting projects would be helpful, especially for roads, industrial areas, housing societies and commercial properties.