Sunmaster Blue Ice Standard Metal Halide (MH) Lamp, 400W, 5500K


Sunmaster Lighting Systems for Greater Yields

Blue Ice 5500K
• Stronger blue component for maximum vegetative growth

Developed by distinguished physicists and leading agricultural researchers, the SUNMASTER line has been built on the marvelous versatility and flexibility of metal halide technology. By blending specific halides in the arc tubes, they have created lamps which offer significantly more usable light energy for hydroponics and horticultural gardening.

Moreover, each SUNMASTER lamp has been customized to meet the diverse nutrition requirements of plants at various stages of their growth cycles. So, while the sun may come and go, SUNMASTER lamps are sure to consistently provide new levels of quality and productivity. If not the sun... SUNMASTER

All Sunmaster® lamps are enhanced for superior operation on high frequency digital ballasts. Each electrode in the lamp uses a special blend of Nickel (Ni 65%) and Copper (Cu 30%). With Sunmaster's spectral families, each lamp is tailored to promote optimum development at each plant growth stage.


0.6 lbs.
12.0L x 4.8W x 4.9H
Mogul (E39)
Metal Halide
1 Year

Which lamps are recommended for use with the Phantom and Xtrasun digital ballasts?

Most lamp brands distributed by Hydrofarm are approved for use in the our digital ballasts. Contact us to find out most up to date compatibility information.

My new bulb isn't lighting up, or only lights up sometimes. How can I fix this problem?

The problem might be a bad connection in the mogul socket. Make sure to disconnect the unit from the power supply, and then look inside the mogul socket for a metal tab. Pry this tab upwards a little bit to make better contact with the bulb base.

What is the importance of color temperature ratings (Kelvin) on bulbs (3000K, 6400K, etc.)?

Kelvin is a unit of measure that rates color temperature of a light source. Lower Kelvin temperatures will display deeper hues of red and orange light. Higher Kelvin temperatures emit deeper concentrations of blue light. As a general rule, one should use lamps with lower Kelvin temperatures for fruiting/blooming/flowering and lamps with higher Kelvin temperatures for vegetative growth.

How often should I replace my grow bulbs?

Whether fluorescent, sodium, or halide, we recommend replacing light system lamps (bulbs) every 1 to 1.5 years if operated for a minimum of 12 hours per day. Although lamps older than this might still ignite for multiple years, the quality of light they provide to the plants will have significantly degraded after this time of continuous use. (NOTE: The above does not apply to LED lamps, which have much longer service lives).