Maybe - if weather permits - you could plant in... May ?

If you cut down on the time under lights then all you get is long lanky, leggy plants. It doesn't slow the growth, only changes the form it takes. So that isn't the solution to having started them way too early. For a June plant out right now would be the time to start them.

You can either transplant them up into somewhat larger containers which will slow them briefly and then transplant them yet again in a couple of weeks or let them continue as is and take cuttings from them to root for the plants you'll plant in the garden and pitch the starter plants.

Dave

If you started them 2 weeks ago, then it will be about 6 weeks till end of May.
That is the most common tomato seeds starting time. Some people even start as early as 8 weeks before plant out date.
So I would let them grow and not to worry.
== Good lighting actually can produce more stocky seedling.
== Fertilizer sparingly. (1/3 strength every other time)
== keep the room temperature low.(Under 70F).
== Water only when needed. Dependining on the media type, pot size.. once every 4-5 days should suffice. Just in case you neglect watering, THEY WILL SHOW WILTING. It would be very obvious to seed.

Good Luck !

Sey

If you can't handle the size I'd transplant them as Dave said which might them back a week. Suspend the nitrogen fertilizer for a while, too similar to Sey's thought. Could they be grown in a cooler place? Another thing to do that is not as drastic as taking cuttings is every other day working from the bottom up to cleanly trim one bottom leaf petiole off the stem until only the smaller ones are at the top, but doing it gradually. That will make them more easy to manage and they should be well healed and you can then plant them quite deep and/or trenched if you have that depth available come transplant time. Hope that gives you more ideas. Another idea, if you have any yellow bulbs, swap them out for blue bulbs 5000-6500 K in their place. If some plants are too high, you can raise the lower ones or they will get even more leggy, but keep the lights as close as possible so plants feel less pressure to "reach" on leggy tippie-toes.

PC

PS I think you could cut back on the lights if the place is cool and dry enough and you have a room to put them in that is demonstrably pitch black in darkness but I don't know if the plant would still get taller in that environment. So that's an experiment you're probably not able to do.

PPS Start a few more seeds immediately if you still have room, for added insurance ;-)

If you can get that temp down, down, down. My Mom had the best situation, keeping plants under lights at 60 degrees. Best I can do is about 70.

thanks all...l usually start them when I did these. last year started in May and they were not big or strong enough to plant out...never had such a bad year...they look good and healthy, I will plant up to larger pots..trouble is I have 70 of them...too many..not enough room..will give some away
early.. Keeping the lights close and moved some into a window (large tall window).. will put a fan on them to make them even stronger...thanks again, martha/zucchini

I just reported some back into the same pots, but removed some of the root and added more
soil less mix so they are planted deeper..they look good, thought they might panic..Its getting
so warm out so fast maybe can plant them out before June...but ...will wait and see..
Martha/zucchini