You need some serious light friend
Im sorry but that is not a cup winner
You can prevent stretch by pinching the stem right after a new node. Careful but gently press the stem with 2 fingers and let it snap/colapse(read up on this). Can even make the plant stronger
But yea the light just aint right. I recommend 250W hps with ballast and relfector. I cut alot of corners with my build but with ok results
Like my loopy post alittle while ago:
Who needs humidity the plants can drink, place a large water tray evaporate
Who needs PH meter i dont mess with my earth and use pottingsoil 10-15% sand and soiltabs
Who needs temprature it feels like the south
Who needs a carbon filter i grow cinderella99
Who needs more than 250W HPS it can get closer to the plants
Windblower 2x30 mins times a day from a distance
Who needs anything lul im sry
I might know a decent amount about cannabis but also believe you cant get further for 200$ (Light and seeds. Very low odour strain. Already had nirvana tabs, pots and some earth around) and with low wattage
These are 3 weeks old topped at 6th node. Even managed to water with very warm water, didnt reverse shower which is why i believe they are cannoeing
But back to the point: Light is all i rely on so that stuff is important. Finally soon getting decent money