How much light does a seedling need?

thank you friends for all the help :) I should have mentioned the plants are destined for outdoor. The current ones I started got stretchy with a LED desk light (not sure wattage, not a bulb), so I'm going to try a mix of this bulb + outdoor sunshine and see how goes.

they need strong light fairly early or you will get weak, stertchy plants. if it falls over and healthy otherwise, the light is too intense. That light would be excellent for clones that need minimal light.. .but 16umol/s isn't going to grow much. MAybe directyl over 1 seedling with somethign reflecting light back in small area too? if it doesn't stretch, it is enough.

Remember that watts from the wall in terms of led lights = yield. The bigger the better! Just take into account the height you have to work with and then look for a lighting setup that will max what you can handle!