I'm not a light spectrum expert nor do i know much about LED's but I've been in sales for a long time. I'm sure if you found a vid from an HPS manufacturer/seller they will obviously have much better things to say about the HPS opposed to the LED's. Not saying LED's aren't better more efficient etc. Just saying that best results found will be the results you find on your own. I currently have two 1k HPS lamps. Now I'm thinking about doing a side by side like these guys......