LED technology has gotten crazy cheap and efficient in the last couple years. You can get a ready to use fixture for as little as $75 shipped or $100 if you prefer more natural looking light. Keep in mind these are VERY powerful lights that can be used to grow a respectably yielding tomato / pepper plant or provide enough coverage for 4-6 sqft of growing leafy greens / cuttings / seed starting - and unlike florescent bulbs you can hang them as high as 1-2’ from the top of your plants versus a couple inches. The final nail in the coffin is that LEDs have a lifespan of 5-10 years before they lose any significant amount of brightness/efficiency which is 2-3X longer than any fluorescent bulb.