Vertical shelf growing has become one of the most popular methods for maximizing crop production in limited spaces. From small home grow tents to large-scale commercial plant factories, vertical farming systems require lighting solutions that are compact, efficient, and capable of delivering uniform light across wide shelf areas. The Koray Lighting RX-PT8 series is purpose-built for exactly this application.
The short answer is yes — the PT8 is not only suitable for vertical shelf growing, it is one of the best tube-form grow lights designed specifically for this purpose. With its IP66 waterproof rating, compact 33x35mm cross-section, daisy-chain capability, and proven PPFD performance, the PT8 series is the go-to choice for growers who need reliable, high-output lighting on every shelf tier.
Frequently Asked Questions
Is the PT8 designed for vertical shelf and rack growing systems?
Yes, the RX-PT8 series from Koray Lighting is specifically designed for vertical shelf and rack growing systems. Its compact 33x35mm cross-section and 1200mm length make it easy to mount under standard shelving units. The IP66 waterproof rating ensures it can withstand the high humidity conditions common in multi-tier growing environments.
How many PT8 tubes do I need per shelf?
For a standard 1.2 x 1.2 meter shelf, Koray Lighting recommends using 6 PT8 tubes to achieve an average PPFD of 300 umol/m2/s at 0.3 meters height. This configuration delivers approximately 133 watts per square meter of canopy area, which is ideal for most leafy greens, herbs, and seedlings. For higher-light crops, you can increase the number of tubes or reduce the hanging distance.
Can PT8 tubes be daisy-chained on a single power supply?
Yes, up to 10 PT8 tubes can be daisy-chained together in a standard configuration, and up to 20 tubes when using the centralized power supply version. This simplifies wiring significantly in vertical rack systems, reducing the number of power cords and electrical connections needed. Fewer connections also mean lower installation costs and reduced points of failure.
What is the coverage area of a single PT8 tube on a shelf?
A single PT8 tube effectively covers a strip of approximately 0.3 to 0.4 meters wide by 1.2 meters long at a hanging height of 0.2 to 0.3 meters. When multiple tubes are arranged side by side with proper overlap, they create a uniform light field across the entire shelf surface. Koray’s secondary optics lens ensures there are no dark spots between tubes.
What crops grow best under PT8 lights in vertical shelves?
The PT8 series excels with leafy greens such as lettuce, spinach, kale, and herbs like basil and cilantro. The F175 spectrum is ideal for most vegetables and general-purpose growing, while the V3 spectrum promotes faster growth rates. The F4K spectrum is optimized for seedling propagation and tissue culture. Many commercial vertical farms growing strawberries also use PT8 tubes successfully.
How does the PT8 handle the humidity in vertical farms?
The PT8 carries an IP66 waterproof rating, which means it is fully protected against powerful water jets and is completely sealed against dust and moisture ingress. In practical terms, this means the PT8 can operate reliably in environments with humidity levels above 80 percent, frequent fogging, and even direct water spray during cleaning cycles. This makes it far more durable than non-waterproof alternatives.
Does the PT8 produce too much heat for enclosed shelf systems?
No, the PT8 is designed to operate efficiently with minimal heat output. At 32 watts per tube, the heat generated is very low compared to traditional lighting options. The aluminum housing acts as a passive heat sink, dissipating heat effectively without the need for active cooling. In vertical shelf systems, this means you can maintain optimal growing temperatures without adding extra ventilation capacity.
What is the recommended shelf spacing when using PT8 lights?
For most leafy green crops, a shelf spacing of 0.5 to 0.6 meters (including the light mounting space) provides enough room for the PT8 tube, adequate air circulation, and plant growth height. The recommended hanging distance from the light to the canopy is 0.2 to 0.3 meters. This allows for plants up to 0.2 to 0.3 meters tall, which covers most lettuce, herb, and seedling applications.
Why Choose Koray Lighting?
Koray Lighting has been a trusted name in horticultural lighting since 2009. With over 200 patents, a 2,800 square meter testing facility, and products exported to more than 60 countries, Koray combines deep optical engineering expertise with rigorous quality control. Every product in the RX-PT8 line undergoes comprehensive testing to ensure consistent PPFD output, reliable waterproof performance, and long-lasting durability. Whether you are setting up your first vertical farm or scaling a commercial plant factory, Koray Lighting provides the technology, support, and proven track record to help your crops thrive.
For more information about the RX-PT8 series or to request a custom lighting plan for your facility, visit www.koraylights.com.
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