How do I choose a reliable solar street light manufacturer in Maharashtra for a road project?

I am looking into solar street lighting for a road project in Maharashtra and want to understand what factors I should consider before choosing a manufacturer or supplier.
There are many options available, but I am particularly interested in understanding the difference between all-in-one and semi-integrated solar street lights, battery capacity, solar panel specifications, expected backup, installation requirements and maintenance.
For someone comparing a solar street light manufacturer in Maharashtra, what specifications should be checked before placing an order? I would also like to know what makes a reliable solar street light supplier in Maharashtra, especially for roads, industrial areas, housing societies and other outdoor projects.
Any practical advice about product quality, installation support, warranty and after-sales service would be helpful.