Metal Halide bulbs have a slight bluish light and are primarily used for

The vegetative (first) phase of Plant growth. The type of light produced

From MH is near the spectrum closest to sunlight (5500 Kelvin) which

Encourages normal growth. 

This Optimized Spectrum MH Grow Lamp allows you to

Stretch your growing season to 365 days a year. Fine-tune

Your lighting system to provide optimum spectral energy

Levels that promote vigorous plant growth. 

Optimized Spectrum MH Grow Lamps provide high initial and

Maintained lumen output with optimum spectral energyrequired

For vegetative growth. 

Optimized Spectrum Metal Halide Grow Lamps are designed to

Grow high quality, natural looking plants during all phases of their

Growth cycles.