HPS and MH 600-700 Watt Lamps: High-Power Lighting for Indoor Growing
HPS and MH lamps of 600-700 watts represent the high-end of traditional indoor grow lighting. This power range offers exceptional light output to effectively cover grow spaces of 1.2 to 1.5 m². Whether it's HPS (High Pressure Sodium) for flowering or MH (Metal Halide) for vegetative growth, these lamps deliver the necessary light intensity for generous harvests.
Why choose HPS/MH 600-700W lighting?
The 600-700W power range is the sweet spot for experienced growers who want to maximize their yields. A 600W HPS lamp produces approximately 90,000 lumens, which is a light density of 150W/m² in a 1.2x1.2m space. This intensity allows for yields of 400 to 600g/m² depending on the varieties grown.
The light spectrum of MH lamps (4200K) promotes compact vegetative growth with short internodes, while the HPS spectrum (2100K) stimulates the production of dense, resinous flowers. The heat generated (approximately 2050 BTU/h for a 600W) can even be an advantage in winter to maintain an optimal temperature of 24-26°C in the grow space.
Unlike LEDs, which require a higher initial investment, HPS/MH 600-700W lamps offer excellent value for money with bulbs available between 15 and 40€. Their proven technology, used for decades, guarantees predictable and consistent results.
How to choose your HPS/MH 600-700W lamp
The choice between 600W and 700W primarily depends on your grow space. For a 120x120cm tent, a 600W is more than sufficient. Beyond 140x140cm, opt for a 700W or two 600W for homogeneous distribution. Check that your electrical installation can handle the consumption: count 650W actual for a lamp advertised as 600W with the ballast.
The type of ballast directly influences performance. Electronic ballasts allow for power variation (400W/600W/660W) and generate less heat than magnetic ballasts. For ventilation, plan for an extractor of at least 400-500 m³/h with a ventilated reflector like a Cool Tube or Adjust-A-Wing.
As for bulbs, prefer renowned brands like Philips Son-T Plus or Osram Plantastar. A 600W HPS bulb has a lifespan of 10,000 to 15,000 hours, but its efficiency decreases after 6-8 months of intensive use. Replace it annually to maintain optimal yield.
Frequently Asked Questions
What size tent or space is best suited for a 600-700W HPS lamp?
A 600W HPS lamp perfectly covers a 120x120cm space, or 1.44 m². To optimize light penetration, do not exceed 140x140cm with a 600W. A 700W can cover up to 150x150cm but with slightly reduced light density. In a larger space, it is better to install two 600W lamps spaced 80-100cm apart for homogeneous distribution. The ceiling height must be at least 2 meters to respect safety distances.
How far should I place a 600W HPS from plants during vegetative growth and flowering?
During vegetative growth, maintain 60-80cm between the lamp and the top of the plants to avoid heat stress. During flowering, you can lower it to 40-50cm if ventilation is sufficient and the leaf temperature remains below 28°C. Use the hand test: if you feel uncomfortable heat after 30 seconds, it's too close. With a ventilated reflector like a Cool Tube, you can reduce these distances by 10-15cm.
What is the difference between HPS and MH in the 600-700W range for my indoor grow?
600W MH lamps emit a blue-white spectrum (4200K) rich in UV, ideal for the vegetative phase as it promotes compact growth and thick leaves. 600W HPS lamps produce an orange-red spectrum (2100K) that stimulates flowering and resin production. In terms of light output, a 600W HPS produces 90,000 lumens compared to 60,000 for an equivalent MH. Some growers use both: MH for vegetative growth then HPS for flowering.
Do I need a specific reflector or a powerful fan to install a 600W lamp?
A reflector is essential to optimize light distribution. Basic models like hammered reflectors are suitable, but Cool Tubes or Air Coolers allow direct heat extraction from the bulb. For ventilation, count a minimum of 400 m³/h extraction with a ventilated reflector, or 600 m³/h with a classic reflector. An oscillating fan of 30-40cm improves air circulation and strengthens stems. Intake should represent 80% of the extraction flow rate.
How to clean and maintain a 600-700W HPS bulb to make it last longer?
Clean the bulb every 4-6 weeks with isopropyl alcohol and a microfiber cloth, when the bulb is cold and the installation is unplugged. Dust and residues reduce light efficiency by 10-15%. Avoid touching the bulb with bare hands as grease marks create hot spots. Regularly check the ballast connections and replace the bulb as soon as it flickers or changes color. A well-maintained HPS bulb retains 90% of its initial output for 8-10 months of 12h/day use.
