Omega 315W CDM Lamp 4000K — Full-Spectrum Grow Light with HPS-Level Output
Best for: Growers wanting professional-grade full-spectrum lighting without the heat penalty or premium price tag of traditional HPS
Our thoughts
This is a proper bit of kit. CDM lamps deliver the spectrum of natural daylight with the intensity of HPS, but run cooler and pull 30% less power. The 4000K variant is genuinely all-rounder territory — works brilliantly in both veg and flower. One growers consistently rate higher than LED alternatives, and that tells you something.
The Omega 315W CDM lamp is a full-spectrum ceramic Metal Halide grow light that delivers the rare thing: professional-grade performance at sensible pricing. It produces a light spectrum closer to natural sunlight than standard HID systems, with PAR output hitting 615 umol/s — enough to properly cover a 75cm × 75cm to 1m × 1m space on just 315W. The 4000K colour temperature leans into veg-focused growth, but because it's full-spectrum, it'll pull results in both phases. Higher efficiency, lower running costs, less heat. That's the deal.
How it compares
This sits in the professional-grade compact fluorescent HID category, and it punches well above its wattage.
- Delivers near-equivalent yields to 700W conventional HPS on just 315W input
- 30% more energy-efficient than traditional metal halide or HPS systems
- Full-spectrum output outperforms standard MH lamps for crop quality and colour
- Runs significantly cooler, reducing climate control costs
- PAR efficiency of 1.9 umol per watt — right up there with professional fixtures
Philips invented CDM technology and set the standard. Omega delivers equivalent performance at a lower entry price without cutting corners on spectrum or longevity.
Usage guidance
The Omega 315W CDM is wired to work with an Omega 315W CDM Digital Ballast, and that pairing is what matters. Swap the ballast and you've got a problem.
Coverage area
One unit covers a 75cm × 75cm to 1m × 1m footprint comfortably. Scale up in larger rooms with multiple fixtures.
Vegetative growth
At 4000K, this lamp delivers broad-spectrum light that tightens internodes, increases vigour, and accelerates growth rates. Run it as a single overhead or pair it with supplementary lights for intensity stacking.
Flowering and bloom
Despite the 4000K spec, the full spectrum includes enhanced reds, so you'll see solid results through flower. Yield and density improve noticeably compared to standard MH.
Heat management
CDM lamps generate considerably less heat than equivalent HPS. In winter, you benefit from the warmth; in summer, your cooling load drops. That's a real cost saving over a season.
Lamp life
CDM lamps maintain efficiency for much longer than traditional HID bulbs before degradation kicks in. Regular replacement (per manufacturer guidance) keeps you at peak output, but you're not chasing dimming the way HPS growers do.
Technical specifications
- Wattage: 315W
- Type: Ceramic-Discharge Metal Halide (CDM/CMH)
- Colour temperature: 4000K (full-spectrum)
- PAR output: 615 umol/s
- Efficiency: 1.9 umol per watt
- Recommended coverage area: 75cm × 75cm to 1m × 1m
- Operating requirement: Omega 315W CDM Digital Ballast (required)
- Lamp construction: Dual ceramic tubes with optimised light geometry
- Key benefit: 30% less energy draw than equivalent HPS; significantly lower heat output
Who this is for
- Growers coming from 600W HPS who want to cut power use and heat without sacrificing yield
- Anyone with climate control constraints or running cooling in summer
- First-time CDM users wanting professional gear without the Philips premium markup
- Operators scaling up from LEDs who want proven HID reliability with modern spectrum
- Growers building efficient year-round systems where heat management is a cost factor
Not a budget fixture — this is proper kit for people who value consistency, efficiency, and professional-grade results.
Our take
CDM lamps are having a moment for good reason. You get the spectrum quality of daylight, the intensity of HPS, the heat signature of LED, and the reliability growers actually trust. This Omega lamp delivers on all of that without the eye-watering cost of premium alternatives.
Pair it with the correct ballast, and you've got a fixture that'll outwork a 1000W HPS on half the power and half the heat. Worth picking up while stock lasts — this is the kind of kit that moves fast.
