Mars Pro light 160 I'm happy with it very much. Anyone can suggest how high LED has to be ? I have it at 34"
For baby seedlings, that LED panel is undoubtedly overkill. It'll work if you find a plant-to-light distance that falls somewhere between so far they fall over and so close they cook, lol. But if you had started with smaller pots (or at least smaller diameter), you could probably have gotten by with that little screw-in LED "bulb" (depending on its actual wattage draw).
Did you start with the large pots because you are growing autoflowering strains and did not wish to end up restricting the roots at some future point, or...?
BtW, what size footprint does that little light cast at 8" / 10" / 12" ? And at what (minimum) distance from the floor do you get a fully-mixed spectrum look to the illumination that reaches the floor (as opposed to it looking like multiple "spots")?