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iPower 400W MH Grow Light BulbSocket E39, this single ended MH bulbs must use E39 lamp base fixtures.Special designed for plant growth, CCT: 6000K, enhanced blue & violet spectrum and high PAR (photosynthetic active radiation) to stimulate vegetative growth. Ideal for rapid growth phase of plants. High lumen output and high power efficiency. 55, 000 Lumens output, compatible with electronic and magnetic ballast.Produces light by an electric arc through the vaporized mercury and metal halides, a mix of metals and halogens.The filament generates a wider spectrum of wavelengths of light, produces more short-wavelength light and has strong light penetration.