Plant Stopped Growing!

Hey guys. I planted this one (aswell as another) 4 weeks ago. 1 is in the garden, but this one is under a mains 60 watt light bulb. It smells good, looks fairy good to me (first time grower and I belive it's either cheese or purple haze.

The thing is, it isnt growing much. Usin Ionic nutes (soil booster)



thoughts please. Lookin to move outside in a few weeks?

Needs more light.

You can make some minor changes to the light schedule then revert it back, that will sometimes kick them out of their funk.

How would I go about doing this please?