Leds are quite attractive from an energy management standpoint. What they do well is deliver a high intensity focused beam with very low power draw. So they can light up a navagational fixture, create a spot beam for reading, but they do not provide very good area
lighting. One measure of light output is a lumen. LED
lights are much lower in lumens per watt than flourescent bulbs. To get the most interior area
lighting per watt look to flourescents. There is a new technology cold cathode ray tube technology that promises even better results but I have not located a viable source yet. So for me it's interior general
lighting - flourescent, task/reading - LED, and Nav - LED. Good flourescents can be purchased from Alpenglowlights.com even with a led night time option.
Good luck with your studies.