Bottom heat is needed only for germination. Once your seedlings emerge they should be taken off the heat and put under the lights.

As above, remove the seedlings to another tray under the lights once they pop through.

No need to run the heat mat, and keep spinning the electric meter once they've germinated.

Oh. OK. I have been running them and most of the seedlings are beginning to put out true leaves now so I will cut off the heat. Thanks,
Bruce