Welcome.... You will need good lights pretty soon.. 1-2 weeks.
4x4 tent is a good start..
Lighting, as well as extraction is important. It costs about $800 - $1000 to get setup right with tent, pots, soil, ph pen, TDS meter, Nutes, Carbon filter, Vortex Fan, venting, water filter, timers, ballast, bulbs and reflector.
Sorry to say, but there is no good LED for $70. That light is probably pushing around $135 watts..The best you can do for cheap LED is the ViparSpectra from amazon... Still not a great option. You would need several of the 450w units to light a 4x4. (All cheap LED light manufacturers lie or mislead consumers with their claims and advertising.)
HID lighting is cheap and grows great weed. We bought a fan, filter, cool tube, ballast and bulb for $100 off of Craigslist one time. Now that a lot of growers are switching to quality LED's the market should be flooded with good deals on used equipment. You will likely want an air cooled hood or cool tube..
Rigging CFL's and other small lights gets really cumbersome.. Not worth it unless you are just growing 1 plant. Even then it's a pain.
My advice, don't waste money trying to save money.. In the end you will end up shelling out the money for a good light and fan.
To light your 4x4 you will need 600w HPS or 400 watts of quality LED. Check out Timber Grow Lights to see what quality LED is.