advantage of LED light source to plantlets? will be significant when sun light is not sufficient or the special purpose you wish to have on that plantlet, such as make it flowered at early timing to get higher price in the market etc. for normal life of plantlet, the nature sun light is always the best source! even we can use LED to simulate the sun light, but just a copy of nature light! Sometime/somewhere we will need to do that by LED to let it have enough light for plantlets!