now you just talking to talk......
there's an active youtube community that tasks itself with finding all of this out.
This isn't just marketing shindings and pseudo-science anymore.... PAR sensors are available now and people have bought them and the numbers are out - LEDs are coming for the grow industry, it is inevitable..
Here's an example of a comparison for 'small' grow lights:
150W HPS - PPFD output - 157. Cost - $200. Consumption - 165W
100W T5s - PPFD - 75 Cost - $100 - Consumption 102 W
Mars300 LED - PPFD - 124 - Cost - $71 Consumption - 121W
QB 120 4K - PPFD - 117 Cost $97 Consumption 61W.
Quantum board LEDs have surpassed HID in PAR readings by a long shot and reduces consumption.
What LEDs don't have that HID does is the 'modular' design which allows for quick repairs when needed.
LEDs don't have that luxury but the tec has proven itself reliable - so much so that a lot of companies don't want to fill shelves with LED offerings because they know it is very likely the last bulb they'll sell that customer....