HPS Grow Lights
Shop premium HPS (High-Pressure Sodium) grow lights, the trusted choice for high-yield flowering in hydroponic and soil setups. Our range includes complete fixtures and dimmable digital kits from LUMii, DimLux, Maxibright, DLI, and Adjust-A-Wing, covering everything from budget-friendly magnetic ballast kits through to precision-dimmable 1000W DE systems. HPS lighting remains a favourite for its strong red-spectrum output, ideal for maximising flower and fruit production at every scale of grow.
What is HPS grow lighting, and why do growers still choose it?
High-Pressure Sodium (HPS) lighting has been the backbone of indoor horticulture for decades, and despite the rise of LED technology, it remains one of the most cost-effective ways to achieve serious flowering output. HPS bulbs produce light by passing electricity through sodium vapour, generating an orange-red heavy spectrum that closely matches what flowering plants respond to best. For growers prioritising raw output per pound spent, HPS is still very hard to beat.
Single-ended vs double-ended (DE) HPS
Our range includes both single-ended and double-ended fixtures. Double-ended (DE) systems — like our DLI Joule Series and DimLux Expert Series — generally deliver higher PAR output and better light distribution per watt than traditional single-ended setups, thanks to a more efficient arc tube design. Single-ended kits, such as our Maxibright Varidrive and LUMii Black ranges, remain popular for their lower upfront cost and simpler ballast requirements.
Magnetic vs digital ballasts
A magnetic ballast (like the LUMii Black Magnetic Ballast) is simple, robust, and typically the cheapest way to run an HPS bulb — a solid choice for growers on a budget who don't need dimming flexibility. A digital ballast (like the LUMii Black Digital Ballast or DimLux Expert Series) gives you adjustable power output — often 250W right up to a boosted setting above the bulb's rated wattage — letting you tailor light intensity to your plant's exact growth stage while running quieter and more efficiently than magnetic alternatives.
How to choose the right wattage
- 315W-400W — smaller tents, propagation-to-early-flower stages, or supplemental lighting alongside LED
- 600W — the most popular wattage for UK home growers, balancing coverage, cost, and heat output for a standard 1.2m x 1.2m tent
- 750W-1000W+ — larger tents or commercial setups where maximum coverage and yield per fixture matters more than running cost
Managing heat
HPS lighting runs hotter than LED, so pairing your fixture with adequate ventilation is essential — check out our range of ducting and extraction fans if you're setting up a new HPS-based grow room. Air-cooled reflectors (like the Maxibright Goldstar) can also help manage heat by drawing air directly across the bulb and out of your tent.
FAQ
Is HPS better than LED for flowering?
HPS remains extremely competitive for pure flower yield, particularly at 600W-1000W scale, thanks to its naturally red-heavy spectrum. Many commercial growers still run HPS specifically for the flowering stage even when using LED for vegetative growth, due to its proven track record on final yield and bud density.
How often should I replace my HPS bulb?
Most HPS bulbs are recommended for replacement every 9-12 months of regular use, even though they may still produce visible light beyond that — the usable spectrum and intensity degrade well before the bulb actually fails.
Do I need a specific reflector for HPS?
Any reflector rated for your bulb's wattage will work, but the shape matters — wide-angle reflectors spread light over a larger area (better for bigger tents), while closed/deep reflectors focus light more intensely over a smaller footprint (better for maximising intensity in confined spaces).
Can I run a 600W bulb on a 400W ballast?
No — always match your bulb wattage to your ballast's rated output (or dimming range, for digital ballasts). Running mismatched wattages risks premature bulb failure or inefficient light output.