Ushio HiLUX GRO CMH Lamp, 315W, 4200K

Photosynthesis-Tuned Ceramic Metal Halide Lamp, 315W

Standard metal halide lamps put out a broad spectrum that isn't specifically weighted toward what plants actually use for photosynthesis, which leaves some of that energy doing little for plant growth. The Ushio HiLUX GRO CMH lamp is tuned differently, running 315W at a 4200K spectrum distribution built for the PAR (Photosynthetically Active Radiation) range, with a blue-heavy output that supports growth and plant robustness.

It's built for professional greenhouse lighting, designed for easy lamp changes and consistent micromole output within the PAR spectral range across the lamp's service life.

Key Features & Benefits

• 315W at 4200K — a ceramic metal halide lamp built specifically for plant growth applications.
• Photosynthesis-tuned spectrum — optimized for the PAR range rather than general-purpose illumination.
• Blue-heavy light output — supports healthy, robust plant growth.
• Long average life, low energy use — lower energy consumption relative to its output than older HID technology.

Who Should Use This CMH Lamp

This suits greenhouse growers who want a ceramic metal halide lamp with a photosynthesis-tuned spectrum rather than a general-purpose metal halide bulb not built specifically for plant growth.

About Ushio

Ushio America, the U.S. subsidiary of Japan-based Ushio Inc., manufactures this HiLUX GRO ceramic metal halide lamp as part of a broader photonics and specialty-lighting catalog spanning horticultural, industrial, and scientific applications.

Frequently Asked Questions

What makes a ceramic metal halide lamp different from a standard metal halide?

A CMH lamp uses a ceramic arc tube rather than a quartz one, which holds up to higher temperatures and produces a more stable, consistent spectrum over the lamp's life. That stability is part of why CMH lamps are positioned as a step up from standard metal halide for plant lighting.

What does 'photosynthesis-tuned spectrum' mean for this lamp?

It means the lamp's spectral output is weighted toward the PAR range plants actually use for photosynthesis, rather than spreading output evenly across wavelengths plants use less efficiently. The 4200K color temperature reflects that blue-heavy tuning.

Is this lamp easy to replace in an existing fixture?

Yes, it's designed for easy lamp changes, though fixture compatibility should still be confirmed before purchase. Check that a fixture is rated for a 315W CMH lamp specifically.

How consistent is the light output over the lamp's life?

It's built for consistent micromole output within the PAR spectral range across its service life, which is one advantage of ceramic over quartz arc tubes. Output still gradually declines with lamp age, as with any HID lighting technology.

Is this lamp suited to home growers or only commercial greenhouses?

It's built for professional greenhouse lighting, but there's no technical reason a home grower with a compatible 315W CMH fixture couldn't use it. It's simply positioned and priced toward professional-scale use.