Grolux 600W Sodium Lamp — High-Output HPS Lamp at Proper Value
Best for: Growers wanting serious PAR output and proven flowering performance without premium pricing
Our thoughts
The Grolux is the lamp that actually gets the job done. It's been the UK standard for years — high PAR, dual-spectrum, and built to perform across both vegetative and flowering stages. At this price point, it's the one we recommend most to growers who want real results without the Philips markup.
The Grolux 600W Sodium Lamp is a high-pressure sodium (HPS) grow lamp designed to deliver serious light output across the full growing cycle. With 90,000 lumens and patented arc tube technology, it produces a dual-spectrum output heavy on orange-red for flowering, but with enough blue to support vegetative growth. This is a lamp that covers the basics properly and won't rinse your budget — proper kit at a much lower price than household names like Philips.
How it compares
The Grolux sits in the high-value segment of 600W HPS lamps.
- PAR output of 802 µmols/m²/sec — beats standard Sunmaster, competitive with budget alternatives
- 30% more blue spectrum than standard HPS — better all-stage versatility than base-model sodium lamps
- Significantly cheaper than Philips GreenPower (£43.95) at a fraction of the cost
- Proven performer — market leader in UK horticultural lighting for years
In practical terms: you're getting lamp performance that actually competes with premium brands, at a price that leaves budget for ballasts, reflectors, and decent nutrients.
Usage guidance
The Grolux 600W works across different growing setups:
Coverage area
Best suited to spaces up to 4x4 feet (roughly 1.2 square metres), where this output hits the sweet spot. Mount at 18-24 inches above plant canopy for optimal light penetration.
Vegetative stage
The added blue spectrum supports healthy vegetative growth, though you'll get better results if you're running dedicated metal halide for veg. That said, the Grolux alone does the job without compromise.
Flowering stage
This is where the lamp shines. The orange-red spectrum is specifically dialled for flowering production. Expect consistent, reliable yields when combined with proper nutrients and environment.
Plant capacity
Typically supports 5-8 medium-sized plants per 600W lamp, depending on spacing and growth stage.
Technical specifications
- Power rating: 600W
- Light output: 90,000 lumens
- Colour temperature: 2050K
- Spectrum: Dual-spectrum (orange-red dominant with enhanced blue output)
- PAR rating: 802 µmols/m²/sec
- Lumen maintenance: 95% at end of lamp life
- Rated lifespan: 24,000 hours
- Base type: E40 / 39-40mm GES
- Dimensions: 48mm diameter × 292mm length
- Bulb type: Tubular
- Technology: Patented arc tube for maximum photosynthesis efficiency
Who this is for
- Growers building their first serious 600W setup and need a lamp that covers both stages
- Budget growers who want proven performance without paying premium brand tax
- Commercial operators running multiple fixtures where cost-per-lamp adds up
- Growers replacing worn lamps and want consistent, reliable replacements
- Anyone wanting to avoid guessing — this lamp has years of track record behind it
Our take
The Grolux is a proper workhorse lamp. It delivers the PAR you need, the spectrum that actually works, and the reliability you don't have to worry about. It's been the UK standard because it does exactly what it should, day in, day out.
Good time to buy while clearance stock lasts. If you're setting up a 600W system or replacing an old lamp, this is the sensible choice — proper horticultural performance at a price that makes sense.
