I decided to plant 3 germinated seeds. I puted 2 light bulbs LED 200 lumens at 15-20 cm distance by the plants, is to much and can stun the plants or to little?
Depends on the LED. I'm not sure how strong LED 200 lumens bulbs are but I start my seedlings at around 30 inches (76 cm). I usually have to lower the light to around 26 inches to prevent stretching but you can definitely toast seedlings if you place strong LED lights too close.
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so I just assumed it was them, which should be ok for the distance mentioned. They will need upgrading very soon, however.