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The taproot appeared after 48h and I planted it right away. I was away on the weekend and came back on the 5 day since the start of germination to find it has sprouted. I let my 5W desk lamp shine on it since it wasn't getting much light. I figured since it is such a weak light source, I can put it really close. It then should signs of light stress so I moved the light back to a reasonable distance and measured the intensity with a luxmeter . It stunted the growth a little but it has recovered since.
The plant gets about 5h of direct sunshine, from sunrise to about 13 o ' clock. So I am running the light all the time.
Quick Note: I am counting the days from the start of germination. I've seen other people start counting days from sprouting. The seed sprouted on day 4, so if you want to compare it with other grows, just substract 4 days.
I again was away on the weekend and left the 5 W 2700 K desk lamp running over the weekend (without a timer). When I came back on day 13, I changed out the desk lamp to an old 11W LED 4500K 850 lm aquarium lamp. It set the distance in a way, that the plant gets 50000 lux. It's been growing way quicker since changing the light. I believe that's because the 4500 K is better suited for the vefetative phase. When I am at home I leave the lamp running while I am awake since I am growing in a dorm room.
The aquarium lamp really isn't optimal, since it spreads the light out. But since I don't need that much bud because I don't smoke a lot, it isn't really worth it to invest in a proper grow light.