I have a 30 long that I have had for years. Knowing that my fl-20 bulb was past its six months I decided to try an experiment.
I retrofitted the hood with standard bulb connectors and added two of these LED bulbs(link at the bottom)
65-Watt Equivalent Indoor LED Flood Light Bulb
PAR30 light bulb
Uses 13.5 watts for 600 lumens of brightness
30000 life hours
Medium base, most frequently used for recessed cans, track lighting, and indoor/outdoor floods
Designed for indoor or enclosed outdoor use only
5000K Natural Daylight
Natural Day light gives a cooler shade of color best used to enhance the mood
Light bulb dimensions 3.75"D X 4.6"L
I can tell you that it is 300% visibly brighter to the human eye.
I will follow up in a couple of weeks, however after 2 hours the Willow Hygro is already chasing the lighthttp://www.lowes.com/pd_321353-75774-LPAR30LDM/5K/LED_0__?productId=3408206&Ntt=utilitech+led&pl=1¤tURL=%2Fpl__0__s%3FNtt%3Dutilitech%2Bled&facetInfo=