why not?

im currently growing 1 plant and im utilizing the sun when its there then bringin it in when its not. basically treating it like its indoor with some sunshine. my question is why not use the power of the sun with indoor lighting? save electricity and powerful light... no? i have been doing this for 3 1/2 weeks-pretty much 24 hrs of light (bout to swith to 18/6) and my plant looks healthy. so why not?

i did this but i used cfls they tended to droop over like they were dead or something or over watered

heres a pic of them todate pic taken today one is droopy but its always been that way and i water 3-4 days

sucks...do you know why they did this or if it directly relates to sun/bulb exposure?