Cold Frames

Looking good and look forward to how your seeds grow.
I have a light box that I put in my conservatory. I use a cardboard box and cut the front away and line the inside with aluminium foil, shiny side out. But I still turn the seedlings around every day.

Want an early start this spring? Build a cold frame. I have a couple of small ones to try out this year, will see how it goes.
https://www.youtube.com/watch?v=zRxF4ejeg1g

Those frames look good! Here in Texas, my soil temp is already about 70F so I started my carrots a couple of weeks ago. I do know that some species of carrots need warm 70F soil to germinate. I planted Bolero carrots from Johnny's Seed and I installed drip tape to keep the seed bed very moist. After about 10 days of constant moistening of the soil I started seeing signs of germination finally. I ended up running the drip tape for 30 minutes every 8 hours and it seemed to put out just enough moisture for good germination of the pelleted seeds. I have very sandy soil, so keeping it consistently moist is a challenge.

I've always wanted to try out a cold frame and I may do that nest year. It is surprising how much they heat up on a sunny day.

When I plant carrots, I cover the bed with a piece of cardboard or plywood. That helps keep the soil moist until they germinate, I saw that trick on a YouTube video.

Another cold frame article I found.....