The press release I got a few days ago from Cree Lighting (one of the other major producers of LEDs and LED lighting products) reported that their newly introduced XLamp XP-G2 LED provides a remarkable 165 lumens/watt in a cool-white and 145 lumens per watt in warm white (assuming 25°C temperature). Measured at 85°F (accounting for worst-case conditions in a fixture), that XP-G2 efficacy drops about 8% — to 151 and 133 lumens per watt respectively.