This years tomato seedlings seem longer and spindlier than usual. Did everything exactly the same as in previous years; T 12 bulbs, 6700 (I think) K; but seedlings seemed to be reaching for the light though in some cases light is touching the plant.
Then realized that this is probably the 4th year for the same bulbs. I changed them out, and the seedlings seem to be thickening up nicely, and are finally getting their true leaves. Now are ready for up potting.
I think it was the old lights. Is 3 or 4 years too long?