In todays's Boston Globe article http://www.youtube.com/watch?feature=player_embedded&v=878-LYQEcPs They talked about what you need to know when buying LED bulbs. Here are best points:
40-watt bulb = 450 lumens
60-watt bulb = 800 lumens
100-watt bulb = 1,600 lumens
For R30 floodlights, look for at least 10 times the watts of the bulb
you are replacing
Look for LED that advertise the color temperature of light you want to match.
2,700 Kelvin (K) Standard incandescent bulbs produce a warm yellowish light
3,000K, is whiter and comparable to halogen
3,500K to 4,100K for a even brighter white
5,000K to 6,500K to mimic natural light or daylight
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