The best value light technology is gas discharge, commercial horticulture companies know this and is the main reason why most commercial indoor facilities are still gas discharge. LED technology is still some time away from being able to regenerate investments over rational timeframes. LED products such as california lightworks, spectrum king, fluence, nextlight, and black dog that provide comparable performance to sodium discharge, require a substantial investment that take years to recover the initial costs.
Evetually LED will superseed all lighting solutions but that time is still a few years or more away. I will myself, knowing lighting technology and plant science. Will continue using gas discharge, until LED has reached a stage of practical and economical value.