I started them with potting mix I bought at lowes made for starting seeds indoors. They do great at first. They germinate and come thru the soil. Then they start to wilt. I have also tried using the little pods of dirt that you just add water and they pop up and you plant seeds in them. Those seeds (brocolli) just grew fast! I lifted the dome (plastic it was part of a set where you get the dome, the part to put the seeds in, divided into 72 squares and a plastic container to put under them). I have watered them and kept the grow light on at least 18 hours a day. It's cold in Maine and my house isn't close to being 75 degrees. I have them growing on a table which is right by the window.
Well my first batch that sprouted up all died. Everyone. They wilted and died. I don't know if it's because it was too hot from the light (it's a sylvania grow light, looks like a flood light, 65 watts, they are specialty bulbs called Sylvania Grow Specialty Bulbs ). They are light blue and make your indoors look like the sun is shining. I even used one in a regular lamp and it surely brightened up my house, but they get hot! And they are supposed to.
I took the dome part way off once the little seeds started coming thru the soil. As they got bigger and bigger I took it all the way off as so many websites, the soil I bought instructions and other media I have read that tells how to grow seeds indoors.
They did fine until out of the blue they start to wilt. I spray them with water. Did no good. I made sure it was lukewarm water.
I'm wondering if the one bulb per tray isn't giving them enough heat? I don't crank my oil heater in the house so it can get to be around 50 degrees inside. Not a big deal, I'm used to wearing a winter coat or several sweatshirts indoors in the winter. Otherwise it would cost a fortune to heat this place!
So could it be they are too cold? If that were the case how did the survive the germination period? I kept lights on them the whole time as it was their source of heat as well.
Should I buy a heating pad and put it underneath? I'm thinking of moving them away from the window and right over the heating vent. If I need too I'll but them on the vent. It's forced air so it comes from the floor.
Am I overheating them? do they need less heat when they are seedlings compared to seeds? I have read everywhere that in Maine we should start our broccoli indoors.
I planted some peppers (sweet banana shaped ones) in another flat and I have yet to see them germinate. My cabbage is doing ok.
Some flats will have only 4 or 5 pots that seeds will grow and that's it. Should I cut these flats into say 4x4 or 2x2 and put them in a plastic bag (I saw one lady who did this).
I'm lost. I don't know if heat killed them, too much light, not enough water, too cold. What? But once they get to a certain size (like 2 inches max) they plop over and wilt and then dead.
Any advise would be great. I'm willing to even experiment. I'll try some with less light and a heating pad, some over the vent, I'll buy some flourescent bulbs if need be and a heating pad which will keep them warm. What do I do? How do I figure this out?
Mom grew hers indoors in the same state and she had a warmer house but never needed a light. I have lights, a lamp for each light that bends, everything and mine are doing awful

The only thing I can't do, unless there is an easier way, is install the long 2 pronged or 3 pronged lights that hang. I'm not an electrician by any means and I would dare to start messing with lights on the ceiling. I plan on buying a fan for the ceiling in the kitchen and livingroom but I'm talking to my neighbor and seeing who he uses as an electrician. I don't know a thing about electricity so I'm not even going there. I can buy just about anything else. I have tried to be clever and think of ways to get those long 2 or 4 foor bulbs to work. The only thing I can think of is to buy cages that a small animal would go in that needs that type of lighting and use those.
Any help would be appreciated and if I posted in the wrong forum I apologize!