btw, others are right...HPS is an HID light. So is MH...High Intensity Discharge refers to both High Pressure Sodium and Metal Halide bulbs...either of which will require ballasts that will probably bust your $75 budget.

Just so you know...you don't need anything like a 4' x 4' for 5 plants, especially small plants like Top44. Besides, unless you've got fem seeds or get incredibly lucky, you're a lot more likely to have 2 or 3 girls. You can do that in 3 sq. ft. with the strains you describe. A 4' x 4' area is for something like 9-14 good sized plants, and would need a 600w HPS or MH. Keep it small and you'll be fine with CFLs.