What is the color Temperature of narrow spectrum fluorescents?
Color temperature ratings don’t Mean much with narrow spectrum fluorescents. They make more very deep red light than traditional low color temperature sources like HPS. While at the same time they actually make much more blue light than high color temperature sources like metal halide. What’s interesting is that the type of deep red light that is most nutritious for plants is barely perceptible by the human eye. So paradoxically, these bulbs look bluish to the eye even though they actually make more red light than blue. Q: Do I need the daylight bulbs or a metal halide spectrum for vegetative growth and then a second set of warm (HPS -like ) bulbs for flowering? A: No. The narrow spectrum bulbs are the best all around bulbs for growing, fruiting, and flowering. You see, HPS lamps make lots of energy that plants need for flowering, but the defective HPS light spectrum produces lanky, stringy growth. (HPS is the same bulb used in street lights) So people will often start plants under a w
