I have M.Sc. in civil engineering and more than 10 years of experience as an engineer and researcher and I know exactly all the thing you mentioned.
I am professional in academic writing without plagiarism, and I can complete your project on time, but first, I need to know more about your task then we can negotiate about the final price.
Note for designing: many software like 3dmax have all the options about the light such as: spot light, beam angles ..... you just need to set light lumens and other parameters and check the results.
Note for production: one of the main different between led and metal halide is the beam, so led can not use easily as street light and needs more test in the factory.
The most important thing for me in Freelancer is to do the clients projects correct and in time.
I look forward to hearing from you!