Yes, if it is in the flowering spectrum or full spectrum you can use one bulb or one set of bulbs from start to finish. I don't think you will do well with 6500K for flowering though, if that's what you started with.
It's a wonderful climate for outdoor growing. And you only have to go as far as your terrace to enjoy the fruits of your labor
Lol, it gets worse... Spain has totally decriminalized cannabis. So when he walks out to his terrace he's greeted by trees full of 4 lbs (each) of the dankest bud. And as he looks around at his neighbor's terraces he sees more of the same
Best I ever got from one lady was 26 ounces of dried/cured. My last grow I got 72 ounces from 4 girls.
I let the chlorine evaporate overnight before I use it. Results have been good so far. I might invest in an RO setup with pre filters for chlorine.
I water mine with tap water - in the summer there is NO other choice here - unless I were to buy mineral water and give them that. I draw the tap water a day in advance and let it sit for 24 hours to get rid of the Cl.