TotalGrow Broad Grow Spectrum Light Bulb for, Efficient Growth Blanket plants with amazingly uniform light in the wavelengths plants need most for quick and healthy growth. Versatile source of growing power for either sunlight supplementation or sole source lighting. Improve growth efficiencies with high-quality light at your ideal intensity, precisely where needed. Custom-tailored full spectrum that is exceptional for plant growth and pleasant to human eyes. Low maintenance and long lifetime with no toxic heavy metals, neurotoxins or breakable glass.