I'm using CFL's at the moment, and the 26w orange tinted "Soft White" or "Warm White" bulbs are rated 2700k and emit 1700 lumens. They are GE, so manufacturer specifications will vary. People recommend using both spectrums for all stages of growth, but since you are going outside soon... that should be cool for a seedling. But yeah, my orange-ish 26w CFL's are 2700k and 1700 lumens. Good luck. Happy gardening :thumbsup: