Reliable high-output HPS flowering lamp built for consistent performance and long-term reliability across full grow cycles.

Osram NAV-T HPS Grow Lamp delivers stable, red-dominant light output engineered for the flowering and bloom phase. With >90% photon retention after 12,000 hours, advanced ignition stability, and a durable ceramic arc tube, it’s built for growers who need consistent results run after run.

Available in 250W, 400W, and 600W — select the wattage that suits your grow room size and HID ballast setup.

Available Wattages

250W — Compact grow rooms and smaller tent setups. Lower heat load with reliable HPS flowering performance.
400W — Mid-size grow rooms. Strong output-to-coverage ratio for hydroponic and soil flowering systems.
600W — The most popular choice for indoor flowering. Maximum efficiency per watt with broad canopy coverage.

Technical Performance

Red-Dominant Spectrum — Optimised for flowering and fruiting phases, supporting flower formation, density, and metabolic efficiency during bloom.
High Photon Retention — >90% output maintained after 12,000 hours. Consistent performance across the full lamp lifespan.
Advanced Ignition System — Reliable startup and stable arc performance. Eliminates flickering and inconsistent output.
Durable Ceramic Arc Tube — Built for longevity under sustained high temperatures in demanding grow environments.

Plant Response

Promotes flower formation and bud density during bloom
Supports metabolic processes and CO₂ assimilation in the flowering phase
Improves overall plant productivity and yield consistency
Maintains reliable output across long operating cycles

Compatible Reflectors

Pair your NAV-T HPS with a reflector that maximises light distribution across your flowering canopy:

Adjust-A-Wing Avenger Reflector — adjustable wing geometry for precise light spread control across any canopy size.
JB Bat Wing Reflector | 95% German Aluminium — broad, even coverage with high-reflectivity aluminium for maximum photon return.
Deep Bowl Reflector — focused downward intensity for higher canopy penetration in smaller grow areas.
Low Bay Reflector (Australian Made) — wide-spread geometry for uniform coverage across larger grow rooms.

Best Used For

Flowering and bloom stage lighting
Indoor grow rooms and grow tents
Hydroponic and soil systems
Growers running HID (HPS) ballast systems at 250W, 400W, or 600W

What problems does the Osram NAV-T HPS solve?

The NAV-T addresses the most common HPS lamp failures — inconsistent flowering results from cheap bulbs losing output quickly, poor bud development from weak or unbalanced spectrum, and unreliable ignition causing flickering and arc instability. Its ceramic arc tube, advanced ignition system, and >90% photon retention after 12,000 hours deliver the consistency that cheaper alternatives can’t maintain.

Best HPS grow light bulb Australia — 250W, 400W or 600W?

Wattage selection depends on your grow room footprint. 250W suits compact spaces with lower heat tolerance, 400W covers mid-size rooms with strong efficiency, and 600W delivers the best output-per-watt ratio for larger indoor flowering setups. All three NAV-T configurations deliver the same red-dominant spectrum, high photon retention, and long-term reliability.

What you'll notice

Consistent, stable light output from first run through to end of lamp life
Stronger flower formation and improved bud density
Reliable ignition with no flickering or arc instability
Long lamp lifespan with >90% output retained after 12,000 hours

Frequently Asked Questions

Is Osram NAV-T HPS Grow Lamp compatible with my existing ballast?

Osram NAV-T HPS Grow Lamp is designed to match standard HPS and MH ballast specifications. Always match your lamp wattage to your ballast wattage exactly. Using a 600W lamp on a 600W ballast is correct — never run a lamp at a wattage it is not rated for. Check the lamp base type (E40 mogul or E27 medium) against your reflector socket before purchasing.

How often should I replace Osram NAV-T HPS Grow Lamp?

HPS and MH lamps degrade over time even if they still produce visible light. Most growers replace HPS lamps every 10,000–12,000 hours of use or approximately every 12 months with a standard 18/6 or 12/12 schedule. Lamps that have dropped below 75% of their original output significantly reduce yields even if they are technically still functioning.

How do I safely dispose of Osram NAV-T HPS Grow Lamp?

HPS and MH lamps contain mercury and must be disposed of responsibly. Do not place in general household waste. Take spent lamps to your local council waste facility or participating electrical retailer for safe disposal through Australia's lamp recycling scheme.

Does Osram NAV-T HPS Grow Lamp ship fast within Australia?

Yes — Osram NAV-T HPS Grow Lamp ships from our Australian warehouse with fast tracked delivery Australia-wide. Most orders to east coast states arrive within 2–5 business days. WA, NT, and TAS orders typically arrive within 5–12 business days.