Cracking seeds in cubes first go this way questions

I planted 5 auto-flower feminized seeds.php in rockwool cubes, but they aren't like the rockwool cubes I have used in the passed. I had heard these were better from my local source --
they are more of a foamy/"crunchy" material, if that makes sense. Either
way, I soaked these slightly and placed the inside the hole putting a little big of Happy Frog over the top. The cubes are placed into a humidity dome and after one night of sitting in
the dark, they have been inside said dome under a 400w HPS for roughly
an hour after some reading that I have done.
I have never sprouted straight from cube, I usually go inside of paper
towel, wait for crack, then plant, but I'm going a different route this
time. Write back here or please PM me if I have done something wrong
that needs to be fixed as I don't want to waste the $60 on these seeds!

Tl;dr do I keep seeds in humidity dome in cubes with happy frog on top in dark on heating pad, or under 400w hps.

Ty

Sounds like you should be OK, it may take some time before they sprout depending on the temp. not sure what you're using, I use rockwool myself and have no problems, some seeds take 6 days or more for me at least, have patients I doubt the cubes will cause any problems. keep in touch would like to know how it works out. I keep a light on all the time tho some say it's not necessary, I feel the seed senses the light and helps it grow....just my opinion tho.

I have the cubes under the humidity dome that's sitting ontop of heating pad, great humidity. Keeping cubes very moist. Should I put under 400w hps or wait a few days? Has been a full 24 hours cube.

If you have a smaller lamp such as CFL or T5 would be OK, even one of those florecent Grow Lights you can buy at your local garden store would be ok, why use up 400 watts? as I said I use a light throughout the whole process from day one, I use T5's so no big deal on elect.

4/5 auto flower mataro blue's have sprouted and are looking beautiful, plan to place into their respective pots tonight in Happy Frog and under the 400W HPS, although it will be raised a little above them as to not burn in their infancy.