The Spectrum Optimized LED Grow Light - This is the LED grow bulb that delivers 50% more spectrally optimized light per watt than other grow lights. Optimizing photosynthetically active radiation (PAR) to maximize plant growth, the passively cooled bulb delivers 12% blue light (400-500nm) to support strong stems and compact growth without the radiated heat generated by lesser bulbs.
Best Grow Lights for Starting Seeds Indoors (Video) - Organic Gardening
Indoor Grow Lights: Two new and better choices, T8 and T5 bulbs, are now available. Old-line T12 fluorescent bulbs are still cheap and easy to find, but T8 bulbs, are up to 40 percent more efficient. Plants get plenty of light when grown within 2 inches beneath T8 bulbs.