you'll never get big buds without proper light, cannabis will always grow with small light but the result will be small as well.

Don't think you will get any decent smoke from it maybe a couple of grams good luck and it's not cheap hobby with electric cost and equipment etc decent setup is around £1000 but you can pay that just for led lights now days

The plant looks like it's growing in the shade. Sure, cannabis is very resilient and can grow under such conditions, but the yield and potency leave much to be desired. It's not about the brightness that YOU can perceive, but rather certain spectrums that the human eye cannot or barely perceives. Regular household lamps are tuned to the human eye and thus unsuitable for cannabis. Invest a little in a good lamp, and you'll see bigger harvests and your electricity costs will drop. (600 watts for such a result is just ridiculous) Good luck!

If you are in UK - DM me, this platform has chat.Small arrow at bottom right corner. I am stopping growing, could send you one.

Is this a question? The reason your plant is so long and spindly is because it is not getting good light, your bud sites will stay small meaning your overall yield will be low. That being said, you are making do with what you have and if you enjoy doing it keep going👍🏻 I’ve upgraded lights 3 times and each time you can see the yield increase with the more powerful lighting