depends on what kind of panel you buy. If you buy the cheap ass 225 led 14w panel off ebay those lights will not contribute to the garden at all. If you spend real money and get some high end 3w chipset, 180w or greater led panels then yes you'll have yourself a party. There is a massive difference in led grow light efficacy, and 9 times out of 10 you get what you pay for. If you're spending less than $200 per panel, chances are it's a piece of crap.