I personally do not like CFL's because of the mercury vapor for one, I mean seriously I won't argue the negative points of using CFL's but you can look up the EPA's recommended hazmat clean up procedures to clean up if you break one of those bulbs and see the points people make on this are true and valid for those who choose to be concerned. By the time its all said and done, CFL's, clamp shop lights, a surge protector to plug them all in, and figuring out a way to make a small wood stand to clamp all the lights to... I'd personally just rather spend $40 and buy a HO T-5 by Sunbeam with a Nano-Tech reflector to increase the light return by 300% (they make that claim) and know I got the right light spectrum, and if you want to join it into making a T-5 panel for $10 they sell you the bar to join I think its a total of up to 5-6 of their T-5's together and come in varying lengths of 2-foot. I have also found the HO T-5's will run cooler than the CFL's, I can also buy the Red or Blue spectrum T-5 bulbs for reasonable prices if I wanted to stick to T-5's...
On the other hand I've seen a super bright LED panel, the P-150 by Platinum LED for $229, and still if price is a real issue I've bought the Grow Light from Walmart for $20 before which is just a standard fluorescent with a cover over the bulb to diffuse the light which worked rather well for the cheap price. Another cheap option I've used if the standard 4-foot fluorescent Shop Light which doesn't come with bulbs and costs $20 at most box stores back in the lighting-electrical department where they sell light bulbs like Walmart, then the bulbs cost you another $10-$20, and they even sell black lights for it too if you wanted to repurpose it later on for something else.
Before anyone considers Mars Hydro, I would take a moment to check out their company videos on YouTube, especially the one titled "We Are Mars Hydro" as I really like to dig into the company's I buy from, once you spend the money, if you have a problem later on with their product; I want to know what to expect in terms to the kind of help and support to expect from that company later on. I've used all of the above mentioned lighting at one point and time or another over the years, with the exception of Mars Hydro.