Don't burn 'em. The first growth from the "seed leaves" is not especially light dependent, as the baby is feeding off the seed. In this phase, it is normal for the plants to stretch. It is also the time when the leaves are most sensitive to light. By the time the leaves show signs of stress, it's too late, and often the babies wilt and die.
Then again, you may not have enough output to do serious damage. I have zero practical experience growing with LED light sources. However, you have close to the same output as a 75 Watt HPS bulb, which will decimate seedlings up close. I have heard from others that the red+blue fixtures put out way more useful plant-growing light than they appear to.
|