No the lumens isn't the most important factor. Lumens is a measure of visible light, it's a measurement based on human eye not how a plant uses light. PAR is a much better measure, photosynthetically active radiation. It takes into account which portions of the electromagnetic spectrum a plant uses to drive photosynthesis. You could put a plant under a billion lumens of green light and it won't grow at all because all the light is reflected off the plant.
phillykid420 Reviewed by phillykid420 on . flowering with florescents? Can you flower the plants with a florscent bulb? I have 4 plants I am using a plant and aquarium florescent bulb it says its designed to promote flowering of plants? And how long would it take to flower them? Rating: 5