Omega 630W CMH Fixture — Full-Spectrum Grow Light with Integrated Ballast & Reflector
Best for: Growers upgrading from HPS or building an energy-efficient setup without faffing about with separate components
Our thoughts
This is proper kit at a sensible price. The 630W CMH format gives you full-spectrum light output with significantly less heat than traditional HPS, and everything you need is built into one unit. Omega tested better than other options on the UK market — that's worth knowing. One we recommend a lot for growers wanting to step up performance without the LED price tag.
The Omega 630W CMH Fixture is a complete ceramic metal halide grow light system with ballast, reflector, and lamp holder integrated into a single unit. No component hunting, no guesswork about compatibility — you get a high-output, full-spectrum light designed to deliver excellent PAR (photosynthetically active radiation) across vegetative and flowering growth stages. CMH technology uses roughly 30% less energy than traditional HPS lighting while producing superior light spectrum and significantly less heat, making it a smart upgrade for growers managing power consumption or grow space temperature.
How it compares
The 630W CMH format sits in a strong middle ground between single-light and multi-light setups.
- One fixture covers up to 5' x 5' in veg, 4' x 4' in flower — meaningful coverage without overkill
- Dimmable ballast (600W–1200W range) gives you flexibility if you want to dial output up or down
- Less heat than HPS means fewer cooling demands and lower running costs — roughly £27/month on UK electricity
- Full-spectrum CDM lamp quality rivals or beats premium competitors at a fraction of the price
Growers switching from 1000W HPS setups have reported yield increases of 30–50% when shifting to CMH, largely due to improved light quality and reduced plant stress from excess heat.
Usage guidance
Vegetative growth (5' x 5')
Mount at around 24–30 inches above canopy. The full spectrum supports robust, compact growth without excessive stretch.
Flowering/fruiting (4' x 4')
Lower to 18–24 inches for optimal PAR distribution. The even reflector design minimizes hot spots and dark corners.
Dimmer control
Use the integrated dimmer to scale output from 600W up to 1200W depending on crop stage, ambient temperature, or electricity budget. Start conservative, dial up as needed.
Supplemental or primary
Works as a standalone light or paired with other fixtures. Growers often run this alongside HPS in larger rooms to get the best of both spectrums.
Lamp type
Fixture ships without a bulb — buy a 630W CDM (ceramic discharge metal) lamp separately. This is intentional; you choose the brand and spectrum that suits your grow.
Technical specifications
- Fixture type: Full integrated ballast, reflector, and lamp holder
- Ballast: Dimmable electronic ballast, 600W–1200W output range
- Lamp compatibility: 630W CDM (PGZ18 socket)
- Reflector: High-efficiency aluminium reflector, optimised for even light distribution
- Coverage area: 5' x 5' (veg), 4' x 4' (flowering)
- Heat output: Significantly lower than HPS equivalents
- Safety features: Built-in thermal protection, short-circuit protection
- Operating cost: Approximately £27/month (UK electricity)
- Lamp not included
Who this is for
- Growers moving away from 1000W HPS systems looking to cut power draw and heat
- Budget-conscious growers who want high-quality full-spectrum light without LED pricing
- First-time serious growers wanting one complete fixture that covers the essentials properly
- Anyone growing in heat-constrained spaces where HPS output creates cooling headaches
- Growers who value UK-tested, locally-available equipment over premium imports
Our take
This is a solid, no-nonsense fixture that delivers real performance at a price that makes sense. Omega CMH fixtures tested better than competitors on the UK market, and at £249.95 you're getting proven kit without the premium markup.
If you're building or upgrading a grow setup and want efficiency, spectrum quality, and straightforward installation, this is worth picking up. Does exactly what it should — day in, day out.
