Section 1:

Purpose, Scope, and Who This Is For

Purpose

Give growers a clear, low-risk path to set up Dialed In under-canopy fixtures and operate the three spectrums with confidence. The goal is simple: increase usable photons below the canopy to drive fuller development of lower sites, improve uniformity, and enhance quality signals in late flower while avoiding stress, herms, or yield loss.

 

What You’ll Get From This Guide

• A step-by-step framework for installing and commissioning under-canopy lighting that plays nice with your top lights, irrigation, and HVAC.
• Channel-by-channel operating guidance for Full+Red, Far-Red, and UV that you can apply on day one.
• Phase-based schedules and safe starting points that you can adjust by cultivar.
• Clear diagnostics to correct issues fast with spectrum, intensity, or timing changes rather than guessing.
• Guardrails that limit the two big failure modes with supplemental spectrum: overexposure and poor environmental support.

Scope

This guide covers:

• Hardware: Tri-Spec under-canopy fixtures and Tri-Chan controller basics needed for setup and daily use.
• Spectrum operation: When and how to use Full+Red, Far-Red, and UV; how channels interact; how to stage intensity as the canopy changes.
• Integration: Syncing spectrum with photoperiod, irrigation, and climate control so the added photons translate to real gains.
• Recipes and troubleshooting: Baseline schedules for common goals and a decision tree to fix symptoms quickly.

This guide does not cover:

• Nutrient brand selection or genetics selection.
• Facility electrical design or permitting beyond basic planning notes.
• Full HVAC design. We will flag where load and setpoints typically shift.

Who This Is For

• Commercial and advanced hobby growers running indoor flower rooms or sealed greenhouses who want consistent, repeatable results from under-canopy lighting.
• Teams that already manage stable VPD, CO₂, irrigation, and sanitation and can make small controlled adjustments when light is increased.
• All defaults assume LED top lighting with under-canopy coordinated to the same photoperiod. HPS rooms may need adaptation due to spectral baselines and heat profiles.

Assumptions and Prerequisites

• Stable environment first: You can hold temp, RH, and CO₂ within your targets during the full photoperiod. If you cannot, stabilize before adding photons under the canopy.
• Irrigation control: You can adjust either feed volume, frequency, or EC to match higher photosynthetic demand. Added light without water and nutrients invites stress.
• Clean airflow: You have active air movement at lower canopy levels to prevent microclimates where UV or Far-Red effects could concentrate.
• Safe handling: You understand that UV requires PPE and scheduled windows to avoid plant and human overexposure.
• Change one variable at a time and log every change.

• Maintain ≥ 6 in clearance from any leaf surface.

• Keep lenses horizontal and at least 4 in inside table rails.

• Change one variable at a time and log every change.

Design Principles To Reduce Crop Risk

1. Baseline first, then layer
   Start with conservative Full+Red intensity, verify environment and plant response, then layer Far-Red pulses and finally UV windows.
2. Midday for UV
   Apply UV only when photosynthesis and transpiration are steady. Avoid UV at lights-on and lights-off.
3. Short exposures, measure outcomes
   For Far-Red and UV, think pulses and windows, not all-day blasting. Extend only after you see positive response with no stress markers.
4. Sync with the whole system
   When you add photons below, confirm top-light PPFD, irrigation timing, dehu capacity, and CO₂ are still matched to demand.
5. Protect the finish
   Late flower is where UV and Far-Red can shine, but it is also where plants are least forgiving. Increase gently and watch edges, tips, and aromas.

Safety Notes and Stop Conditions

• If leaves canoe, bleach, or edges burn after changes, reduce the last spectrum you increased by 25 to 50 percent and reassess after 48 hours.
• If internodes extend unexpectedly early flower, reduce Far-Red pulses or move them to end-of-day only.
• If terps smell muted or plants stall after adding UV, cut UV exposure in half or pause for 3 to 5 days before retrying at a lower dose.
• Human safety: Use eye and skin protection when servicing fixtures during UV windows. Do not look directly at lit diodes.
• Post a no-entry rule during all UV windows. Schedule UV when no one is servicing plants.

How To Use This Guide

• Read Section 2 to confirm hardware capabilities and limits.
• Follow Sections 3 to 5 to prep the room and commission safely.
• Use Sections 6 to 12 to select a spectrum strategy, then copy a baseline schedule.
• Keep Section 10 handy for fast corrections during the run.

Section 2:

Hardware Overview

Tri-Spec 150W UCL: What it is and why it matters

Role: Purpose-built under-canopy LED with three independently tunable channels: Full+Red, Far-Red, and UV. It puts controllable spectrum where top fixtures struggle to reach, lifting development of lower sites while protecting finish quality when used correctly. 

 

Core performance

• Input power: 150 W
• PPF: 450 μmol/s
• Efficacy: 3.1 μmol/J
• Beam angle: 120° for wide under-canopy coverage
• Control: 3-channel, 0–10 V dimming per channel (Full+Red, FR, UV)
• Lifetime: L80 ≥ 50,000 hrs
• IP rating: IP66, passive cooling (fanless)
• Electrical: 120–277 V, 1.25 A max, PF ≥ 0.96, THD ≤ 15 percent
• Physical: 45.9″ × 3.2″ × 3.2″, 7.9 lb
• Mounting height target: 8–20 inches under canopy
• Daisy-chain fixtures per circuit must follow table and your site’s electrical capacity.
• Warranty: 5 years. 

Channel purpose at a glance

• Full+Red: Baseline driver for photosynthesis, structure, and flower site formation. Keep this as the “always-on” backbone during the photoperiod, scaled to canopy density. 
• Far-Red (≈730 nm): Deeper penetration, phytochrome steering, Emerson pairing, and finishing speed. Use to manage stretch early and to accelerate ripening and resin signals late. 
• UV: Low-dose, late-phase quality signal. Used correctly, increases trichome density and terpene expression. Dose conservatively to avoid stress. 

Placement and integration

• Install under the primary canopy layer, aligned with plant rows. Avoid setting fixtures directly on cultivation tables to protect irrigation and ensure airflow. 
• Run in coordination with your top-light cycle so lower sites are photosynthetically active when the canopy is. 
• Start conservative: 50 percent Full+Red at commission, then scale based on plant size, stage, and environmental headroom. Consider trimming top-light intensity if temp or RH will not stabilize after adding under-canopy photons. 

• Start height ≈ 14 in below canopy (range 8–20 in).

• Perpendicular to tables gives best spread and access; parallel is acceptable.

Accessories

• Height-adjustable under-canopy stand (10.0–21.8 inches), folds flat for room flips. 
• 1 m, 3 m, and 6 m daisy-chain cords for clean runs. 

Risk guardrails baked into the hardware section

• Do not bring Tri-Spec online too early in flower if your HVAC cannot handle added latent load. Let plants size up so transpiration helps stabilize the room. 
• Expect higher nutrient demand when you add photons under the canopy. Adjust EC or frequency to prevent deficiency. 
• If petioles elongate rapidly, Far-Red is too high for that phase or cultivar. Reduce FR and bias back to 660 nm. 
• UV is minimum-effective-dose only. If edges singe or plants stall, cut duration or intensity immediately. 

Tri-Chan Controller: The control surface

Role: Three-channel, touchscreen controller designed for Tri-Spec. Gives independent 0–10 V control of Full+Red, Far-Red, and UV with scheduling, sunrise simulation, and sensor awareness. 

 

What it does for growers

• Precision output: Individual 0–10 V dimming on all three channels. Build cultivar-specific “recipes” and time-of-day moves without pulling cables. 
• Scheduling and scenes: Phase-based schedules, time-based dimming, and sunrise simulation to smooth transitions and reduce stress. 
• Environmental awareness: Plug-in temp and humidity sensors, plus PPFD support, so you are reading the room as you steer spectrum. 
• Expansion-ready: Dual RS485 ports for future devices and integration. 

Key tech specs

• Dimming output: 3-channel 0–10 V (Full+Red, Far-Red, UV)
• Input voltage: DC 12 V
• Display: 4.3 inch HD touchscreen
• Power consumption: max 10 W
• Sensor inputs: Temperature, or combined temp-humidity
• Expansion: 2× RS485
• Size and weight: 160 × 98 × 33 mm, 0.33 kg. 

Commissioning guidance with Tri-Chan

• Bring Tri-Spec online at 50 percent Full+Red, sync on/off with top-lights, then stage Far-Red pulses at lights-on and lights-off before adding any mid-day FR or UV windows. Use scenes to keep changes consistent across rooms. 
• Add UV last, in midday windows only, and only after environment is steady and plants show no stress at the current FR:Red balance. 

• On first power-up, set date, time, and timezone.

• Connect the Tri-Chan temp/RH probe at lower-canopy height.

Why this pairing works

Tri-Spec provides the photons and three targeted spectra. Tri-Chan provides the safe, repeatable control surface to apply them. Used together, you can run baseline Full+Red all day for development, add Far-Red in defined pulses or mid-day pairing for Emerson efficiency and finishing speed, and apply tightly controlled UV windows near the finish for quality—while protecting your environment and the crop.

 

Section 3:

Room Prep and Safety Guardrails

This section is your preflight. Set the room up so added under-canopy photons translate into gains, not stress.

 

Environmental prerequisites

• Hold steady targets before activation

• • • Temp and RH stable through the entire photoperiod.
    • Consistent VPD for the stage you are in. Avoid large swings at lights on/off.
    • CO₂ delivery verified and uniform when top lights are on.

• Airflow at the lowers

• • • Ensure gentle, continuous movement below the canopy with no dead zones.
    • Aim fans so air moves across fixtures and through foliage without whipping leaves.

• Irrigation control is non-negotiable

• • • You must be able to adjust frequency, volume, and EC. Added light increases demand.
    • Confirm uniform distribution and drainage. No pooled runoff, no clogged emitters.

• Cleanliness

• • Clear drip lines, remove debris, wipe tables, and sanitize contact points.
  • Keep fixture lenses clean and dry; dust reduces output and can create hot spots.

Heat, moisture, and load planning

• Expect more transpiration

• • • Under-canopy photons drive lower leaves. Plan for increased water use and higher latent load.
    • Verify dehumidification headroom. If RH creeps up after activation, either reduce intensity or increase dehu capacity and air exchange across the lowers.

• Thermal map, not just canopy sensors

• • Place at least one temp/RH probe at lower-canopy height. Compare to top-canopy readings.
  • If lower-canopy temps rise when fixtures come on, increase airflow before reducing light.

Electrical and mounting safety

• Power

• • • Use dedicated circuits sized for inrush and continuous load. Follow local code.
    • Keep drivers and connections dry, elevated, and strain-relieved. Use GFCI where required.

• Mounting

• • Secure fixtures on stable, non-conductive mounts under the canopy. Do not obstruct irrigation or runoff paths.
  • Route cables along frame members with drip loops. No cables lying in trays or aisles.

UV safety and handling

• Human safety first

• • • Post a no-entry rule during all UV windows.
    • Schedule UV windows when no one is servicing plants.
    • Wear eye and skin protection if you must enter during UV windows. Never look into lit diodes.

• Plant safety

• • UV is a finishing tool. Start low, keep it midday only, and watch tips and margins.
  • If you see edge singe, halted growth, or terpene flattening, cut the last UV change by 50 percent and reassess after 3 to 5 days.

Nutrients and irrigation sync

• Match the photons

• • • Added light without water and ions leads to deficiency or stress. Be ready to increase irrigation frequency and, if needed, modestly increase EC within your system’s normal range.

• Watch the signals

• • Positive response: slightly stronger turgor, better lower-site development, stable color.
  • Overpush: sharp tip burn, “dry” look despite moisture, runaway EC, or leaf edge curl. If seen, back off the last intensity increase before touching nutrients.

Commissioning order of operations

1. Stabilize the room for 24 to 48 hours on your normal top-light program. Log temp, RH, CO₂, and runoff EC.
2. Mount fixtures ≈ 14 in below canopy (range 8–20 in) for first activation.
3. Power the under-canopy network, confirm addressing and control with Tri-Chan.
4. Bring on Full+Red only at ~50 percent, matched to the top-light photoperiod. Hold 24 to 48 hours and observe:
   1. Climate drift at lower canopy
   2. Irrigation needs (runoff and media EC)
   3. Plant posture and color
5. Add Far-Red next as brief pulses at lights-on and lights-off. Hold 48 hours, then decide if you’ll add a short midday FR pairing window.
6. Add UV last and only if plants are thriving under the current Full+Red and Far-Red balance. Start with a very short midday window in late flower.
7. Change one variable at a time. Document each change with time, duration, and plant/room response.

Stop conditions and fast rollbacks

• Any acute stress after a change

• • • Roll back the last spectrum change by 25 to 50 percent or remove that window entirely.
    • Keep top-light and irrigation steady while you re-evaluate. Do not stack new changes.

• Humidity runaway

• • • First increase airflow and dehu. If unresolved, reduce under-canopy intensity in 10 to 20 percent steps and shorten any FR/UV windows.

• Unexpected stretch in early flower

• • Reduce Far-Red exposure to end-of-day only. Re-balance with stronger Full+Red instead of adding blue from other sources.

Preflight checklist (print this)

• VPD and CO₂ stable across the day
• Lower-canopy fan coverage verified
• Dehu headroom confirmed; lower-canopy temp/RH probe installed
• Irrigation uniformity tested; runoff EC within target

• Footprint plan verified: two Tri-Spec per 4×4 or 5×5 area.

• Tri-Chan sensor installed at lower-canopy height.

• Fixtures mounted, cabled with drip loops, IP rated connections dry
• Tri-Chan scenes created: Baseline Full+Red, FR pulses, UV window (disabled)
• PPE available and UV window locked to “no-entry”
• Logging sheet or digital tracker ready

When this all checks out, you’re cleared for Section 4: Physical Setup and Placement.