Join Date: Feb 2011
Location: Baltimore Maryland
There's no relationship between the two. And lumens isn't useful either for plants. What lumens is telling the buyer is how bright the light will appear.
2700k light sources might be deficient in blue light which would deprive the plants of a necessary portion of the spectrum. A better choice is a bulb with a color temperature of 5500k and a color rendering index of at least 90.