Omega 315W CDM Lamp (3000K) - Ceramic Metal Halide Grow Lamp
Best for: growers running a 315W CDM ballast who want a warm-spectrum 3000K lamp for flowering.
Our thoughts
This is the lamp that completes the Omega 315W CDM kit alongside the matching ballast and reflector, and the 3000K colour temperature makes it the flowering-focused option in the range. CDM technology genuinely does produce a noticeably different, more natural-looking light than older HPS setups.
The Omega 315w CDM Lamp is a ceramic discharge metal halide (CDM) grow lamp in a 3000K colour temperature, designed to deliver a light spectrum closer to natural sunlight than standard high-intensity discharge (HID) lamps such as HPS or MH. CDM technology uses an advanced ceramic arc tube rather than the quartz tube found in older HID lamps, which improves light output, efficiency and lamp lifespan while producing high levels of usable PAR (photosynthetically active radiation) for the plant.
At 3000K, this lamp sits on the warmer end of the CDM spectrum range, making it well suited to flowering, though CDM's broad spectrum means it can be run through a full grow cycle if you don't want to swap lamps between vegetative and bloom.
How it compares
CDM lamps as a category compete directly with HPS for flowering, and with each other on spectrum and lifespan.
- Produces a broader, more natural-looking spectrum than a standard HPS lamp of similar wattage, at the cost of a slightly higher unit price
- A more affordable route to 315W CDM lighting than buying a lamp bundled into a Gavita or Lumatek integrated fixture
- Must be run on a compatible 315W CDM ballast, such as the Omega 315W CDM Digital Ballast - it isn't interchangeable with HPS or MH ballasts
If you've already decided on CDM over HPS, this is a straightforward, correctly specified lamp for a 315W system.
Usage guidance
Ballast compatibility
Only run on a 315W CDM-rated ballast such as the Omega 315W CDM Digital Ballast - running a CDM lamp on the wrong ballast type will damage the lamp or fail to strike it.
Burn position
Fit the lamp in the orientation specified by the manufacturer (typically horizontal for reflector-mounted setups) - CDM arc tubes are sensitive to burn position, and running them incorrectly shortens lamp life.
Warm-up time
Allow the lamp a few minutes to reach full output after striking, and avoid switching it off and straight back on, since CDM lamps need to cool before restriking reliably.
Technical specifications
- Brand: Omega
- Lamp type: CDM (ceramic discharge metal halide)
- Wattage: 315W
- Colour temperature: 3000K
- Compatible ballast: 315W CDM ballast (e.g. Omega 315W CDM Digital Ballast)
- Suitable growth stage: flowering (full-cycle capable)
- Technology: ceramic arc tube
Who this is for
- Growers running a 315W CDM ballast who need a compatible lamp
- Anyone prioritising flowering-stage spectrum and bud quality over running costs
- Growers switching from HPS who want to try CDM's natural-spectrum output
- Buyers completing the matched Omega ballast, reflector and lamp kit
Our take
As the finishing piece of the Omega 315W CDM kit, this lamp does what CDM lamps are bought for - a fuller, more natural spectrum for finishing flowers. Buy it alongside the matching Omega ballast and reflector rather than mixing it with unrelated kit, and you've got a properly specified 315W lighting rig.
Does exactly what it should, day in, day out.
