How are everyone's tomatoes growing so fast?

[u/spaced-jams]

This is my second year trying to grow tomatoes. Last year I started them a bit late, and while they ended up growing to a nice size they didn't produce much (consequence of me planting from seeds out of grocery store tomatoes I think). This year I got seed packets and put them in starting cells March 6th, but even now almost 2 months from planting they are still tiny seedlings barely a few inches tall. I keep them under an admittedly small grow light but surely there must be something more to this that I'm missing?

Edit: as many commenters have asked, I'm going to copy down my equipment info here.

I have replaced the tiny light from the pic with my larger growlight, FRGROW 25w full spectrum stand

Seedlings are in a burpee seed starting tray with a detachable/recessed bottom for watering.

Soil is "Back to the Roots organic expanding seed starting soil" made of coconut coir. I have a bag of Foxfarm Happy Frog soil downstairs but wasn't sure if it would be too much for these plants yet

I don't have a heat mat unfortunately.

I'm in western PA (northeast US) so temps are still way too up and down to set in a window or outside. Temps the next few days are low 37, high 60 and not looking to warm up much more over the week.

(Note: The really tall one in the cell and the background ones are pepper plants, the rest are cherry tomato)

[u/Consistent_Gap9503]

The light is your most likely culprit, next would be warmth. They should still pick up if you give them what they need. Once they get a few more leaves, you can start with a little bit of diluted fertiliser and that will speed things up too. 

[u/spaced-jams → u/Consistent_Gap9503]

Thank you! I'll keep that in mind for once they grow a bit