Hey Growmie,
For the size tent, your using your going to need at least 400 watts of light and that's on the downside, now with that being said and understanding you're on a budget I would suggest something like the VIPARSPECTRA UL Certified 450W LED Grow Light or the VIVOSUN VS1000 LED Grow Light both would be great for your setup and they don't cost an arm and leg.