• LEDs get better yields for the same amount of electricity than CFLs. This is because LEDs are much more efficient (produce more light for the same amount of electricity)
• Unlike CFLs, LEDs don't need to be adjusted almost daily LEDs give off less heat than a CFL setup with the same amount of watts, and LEDs also come with additional cooling options like heat sinks and built-in fans, which pushes all the heat up and away from the plants, making it easier for growers to maintain comfortable temperatures.
• LEDs need to be kept much further away from plants than CFLs, which means that CFLs are better suited to short grow spaces without a lot of available height. LED grow lights generally need to be kept 12-18+" away from the tops of plants, while CFLs can be kept just a few inches away. 

LEDs vs MH/HPS

• If you’re most concerned with improving your yields/watt, skip the LEDs and get an HPS grow light for your flowering stage. Although LEDs are catching up and there are some really great LEDs out there that get comparable results, HPS still tends to give you bigger yields when it comes to how much electricity is being used.
• LEDs can get pretty pricey, though not all brands! In fact, some great brands are actually some of the cheapest!
• Several growers believe LEDs produce higher quality buds (more trichomes, higher potency, and bring out the natural taste and smell of buds). They also tend to bring out colors.
• LED grow lights come with built-in cooling systems and heat sinks which vent air up and away from plants. This can make it so that you can hang the LED grow light in your tent and not necessarily need an exhaust system to control the temperature
• LEDs are plug-and-play which means you can plug them directly into a wall without a ballast