GrowPros Solutions HM660 660 Watt 4ft by 4ft LED Grow Light

The GrowPros Solutions HM660 LED Grow Light is a high-performance horticultural lighting system engineered for indoor cultivation, hydroponic grow rooms, and greenhouse environments. Designed to deliver powerful illumination across a 4 ft × 4 ft canopy, this 660-watt full-spectrum LED fixture provides balanced light output that supports plant development from the vegetative stage through flowering.

Built with a sun-like full spectrum enhanced with deep-red LEDs, the HM660 replicates natural sunlight to maximize photosynthesis and encourage vigorous plant growth. This optimized spectrum helps improve plant structure during the vegetative stage and boosts flowering performance for higher crop yields and improved quality.

The fixture produces approximately 1716 µmol/s of PPF at 660W and up to 1820 µmol/s when boosted to 720W, delivering strong canopy penetration and consistent PPFD across the grow area. With a photon efficacy of about 2.6 µmol/J, the HM660 provides powerful output while maintaining energy efficiency compared with traditional HID or HPS lighting systems.

Designed for commercial cultivation environments, the HM660 features an integrated dimmer adjustable from 0–100% with a 110% boost mode, allowing growers to fine-tune light intensity according to plant growth stages. The system also supports 0–10V dimming and controller integration, including compatibility with professional control systems such as TrolMaster Hydro-X for automated lighting management.

The fixture incorporates a foldable multi-bar design with passive cooling, ensuring efficient heat management and quiet operation. Its modular structure includes extendable side bars that can be added to expand coverage for larger grow trays such as 3 ft × 6 ft or 4 ft × 6 ft setups. Built with durable components and an estimated lifespan exceeding 54,000 hours, the HM660 offers long-term reliability for professional growers.

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Key Features

• 660W full-spectrum LED grow light optimized for indoor cultivation

• Coverage area: ideal for 4 ft × 4 ft grow spaces (up to 5 ft × 5 ft)

• High output: up to 1820 µmol/s PPF at 720W boost mode

• Photon efficiency: approximately 2.6 µmol/J PPE

• Full spectrum with deep-red LEDs for both vegetative and flowering stages

• Integrated dimmer with 110% boost capability

• 0–10V dimming and controller compatibility (TrolMaster Hydro-X supported)

• Foldable multi-bar design for easier installation and maintenance

• Passive cooling system for low heat and quiet operation

• Energy-efficient LED technology offering up to 30% savings vs HID/HPS lighting

• Built for commercial indoor farms, grow tents, hydroponics, and greenhouse cultivation