250W or 400W ballast?

Grow closet is 2'x4'x8'

The plan is to grow about 2-3 plants with a maximum of 5 (canadian laws bill c-15) and maybe grow a few other plants and fruits like raspberries...etc.

This is for personal use. Most important is bud quality, not quantity. Is there a big difference in temperature and electricity cost between a 250w and 400w?

And what about digital vs magnetic? From what I have heard, digital ballasts seem to be quite unstable. The most important thing for me is safety. What is least likely to catch on fire...magnetic or digital?

Thanks
 
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