Overview
The PT8T-2H is the dual-channel, adjustable-spectrum member of Koray’s PT8T T8 tube family – the official datasheet PDF calls the model RX-PT8-2H, while the official product page, media files and spec-table image carry the PT8T-2H label. Everything fits inside one standard T8 tube, L1200 x 33 x 35 mm: two independently adjustable channels, CH1 multi-blue R12-1 (20 W) and CH2 multi-red R12-2 (20 W), both running on DC24V input. Official page positioning: dual-channel adjustable spectrum for experimental planting, plant factories, layered hydroponic racks and vertical agriculture – ‘channel 1 high blue light and channel 2 high red light can be adjusted as needed’. With both channels at 100% the tube outputs the R12 spectrum, up to 380 µmol/m²/s at the 0.2 m suspension height. All figures in this article come from the official product page, its official spec-table image and the official RX-PT8-2H datasheet PDF.
Key Specifications
Channel data from the official spec table – identical on the PT8-2.jpg spec-table image and datasheet page 1. One 1200 mm T8 tube (L1200 x 33 x 35 mm) carries all three modes.
| Parameter | CH1 – R12-1 (multi-blue) | CH2 – R12-2 (multi-red) | CH1 + CH2 100% (R12) |
|---|---|---|---|
| PPFD @ 0.2 m | 165 µmol/m²/s | 215 µmol/m²/s | 380 µmol/m²/s |
| PPFD @ 0.3 m | 115 µmol/m²/s | 145 µmol/m²/s | 260 µmol/m²/s |
| PPF | 46 µmol/s | 58 µmol/s | 104 µmol/s |
| Power | 20 W | 20 W | 40 W |
| Input | DC24V | ||
| Official comment | Seedlings and Vegetative Growth | Promote Flowering | flowering stage |
Two Channels, One Tube: Blue R12-1 for Seedling Growth, Red R12-2 to Promote Flowering
The two channels are not just two colors in one housing – each carries an official job description. CH1 (R12-1 multi-blue) delivers 165 µmol/m²/s at 0.2 m (115 at 0.3 m; PPF 46 µmol/s; 20 W) and the datasheet comments ‘Seedlings and Vegetative Growth’. CH2 (R12-2 multi-red) delivers 215 µmol/m²/s at 0.2 m (145 at 0.3 m; PPF 58 µmol/s; 20 W) and the comment ‘Promote Flowering’. Because both channels live in one tube and each channel is adjustable on its own, the grower can program a bench or rack shelf by growth stage – blue-rich R12-1 through the seedling and vegetative phase, then red-rich R12-2 as the crop moves toward flowering – instead of swapping fixtures between phases.
Both Channels at 100%: R12 Spectrum, up to 380 µmol/m²/s at 0.2 m
Open both channels fully and the two halves merge into the R12 spectrum: 380 µmol/m²/s at 0.2 m (260 at 0.3 m), PPF 104 µmol/s at 40 W total, DC24V. The official comment for this both-on mode is ‘flowering stage’, and the page adds that the R12 spectrum is ‘for high-speed growth of various plants’. The 380 µmol/m²/s headline is quoted at a 0.2 m suspension height – the same distance used for the per-channel figures above – which makes the trial setup as simple as hanging the tube and measuring 20 cm.
Dimmer, DC24V Power and 10-Tube Series Layout
The tube is DC24V powered. Per the datasheet wiring page, the two channels are driven with a regular dual-channel dimmer (conventional PWM DC dimmer wiring CH1+/CH1-/CH2+/CH2-) or with a CCT color-temperature dimmer – dimming is per channel, which is exactly what a light-ratio comparison needs. The product page also lists support for a centralized high-voltage DC power supply, with series connection recommended at 10 pieces – handy when a whole plant-factory shelf bank runs the same trial program.
Environmental ratings from the 2H datasheet footer: waterproof IP64, lifespan 50,000 h (Ta ≤ 25 °C), working temperature -10 °C to 30 °C, measurement tolerance ±10%. Certified CE / RoHS / FCC.
A Per-Stage Trial Tube for Plant Factories and Experimental Planting
PT8T-2H is a stage-programming and comparison tool, not just another rack tube. On a single low bench – tubes hung about 0.2 m above the trays – one half of the bench can run CH1 blue for seedling and vegetative development while the other half runs CH2 red, then both channels can be dialed back to compare ratios at equal intensity. The image below shows exactly this setup: the blue-lit half and the red-lit half of the same seedling bench, with no multi-tier hardware involved.
FAQ
Q: What exactly is the PT8T-2H? A: Koray’s dual-channel T8 tube (L1200 x 33 x 35 mm) with two independently adjustable channels in one tube – CH1 multi-blue R12-1 and CH2 multi-red R12-2, DC24V. Official datasheet PDF model RX-PT8-2H.
Q: What are the per-channel specifications? A: CH1 R12-1: 165 µmol/m²/s at 0.2 m, PPF 46 µmol/s, 20 W – ‘Seedlings and Vegetative Growth’. CH2 R12-2: 215 µmol/m²/s at 0.2 m, PPF 58 µmol/s, 20 W – ‘Promote Flowering’.
Q: What happens with both channels at 100%? A: The R12 spectrum: 380 µmol/m²/s at 0.2 m (260 at 0.3 m), PPF 104 µmol/s, 40 W, DC24V – official comment ‘flowering stage’.
Q: How is it dimmed and powered? A: DC24V input; regular dual-channel dimmer (CH1+/CH1-/CH2+/CH2-) or CCT dimmer; centralized high-voltage DC supply supported; series connection recommended 10 pieces.
Q: Waterproofing, life and environment? A: IP64; 50,000 h (Ta ≤ 25 °C); working -10 °C to 30 °C; CE / RoHS / FCC.
Q: Where is it used? A: Experimental planting, plant-factory and vertical-farm bench and rack trials; hang about 0.2 m above the crop.
Why Choose Koray
Koray (Zhongshan Koray Photoelectric Co., Ltd.): LED grow lights since 2008; 1,000+ professional growers; 300+ patents; National High-Tech Enterprise; exports to 20+ countries/regions. Figures sourced from the official PT8T-2H product page, its spec-table image and the RX-PT8-2H datasheet – koraylights.com.
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