ECO-R Underlight 140W by HORTITEK - intercanopy LED grow light

The problem this solves

Big tops. Patchy lowers. Uneven development.

The ECO-R Underlight 140W is built to push serious photons into the shaded middle and lower canopy zones your overhead fixtures can’t properly penetrate.

In dense hydroponic and commercial grow rooms, light loss under the canopy costs you uniformity. This intercanopy LED grow light fixes that by delivering up to 406 µmol/s exactly where it’s needed - boosting balanced growth and tightening up lower flower sites without blowing out your power bill.

If you’re already running quality top lighting, this is how you stop wasting the bottom half of your plant.

🔥 Why growers rate it

Key benefits

• Up to 3.3 µmol/J max efficacy → Elite efficiency when dimmed, strong output at full power

• Up to 406 µmol/s PPF → Serious supplemental punch for a 140W fixture

• Two spectral options (3000K or 5800K) → Tailor under-canopy support to flowering or vegetative strategy

• IP66 rated housing → Built for humid, high-density grow environments

• 0–9V external control → Integrates cleanly into controlled commercial systems

• 150° beam angle → Broad spread to evenly cover lower canopy zones

• Compact 3.05kg build → Easy to install vertically or horizontally without stressing frames

This isn’t a replacement for your main LED array. It’s a yield-balancing tool for growers who care about uniform plant development.

🛠️ How to dial it in properly

Placement

Install between plant rows or vertically through trellis layers to target shaded bud sites. Focus on areas where overhead PPFD drops off sharply.

Mounting

With a slim 1192mm profile and passive thermal management, it can be mounted horizontally or vertically depending on room layout and airflow planning.

Photoperiod relevance

Run during veg with the 5800K option for structure support, or during bloom with 3000K to reinforce lower flower development. It’s supplemental - not standalone.

Dimming & control

Compatible with 0–9V LED control systems. Dial intensity based on canopy density and stage of growth to prevent light stress.

Chaining strategy

Power and signal chaining varies by input voltage (up to 12 fixtures depending on voltage). Plan circuits carefully before install to avoid overloading.

Heat & environment

IP66 rating means it handles high humidity and demanding commercial environments. Passive cooling keeps it quiet and low maintenance.

Pro tip

Map your under-canopy PPFD before installing. Guesswork leads to hot spots and wasted photons.

🌱 Grow Guys tip

Most growers underestimate how much usable yield lives below the top third of the plant.

If your lowers are fluffy while your tops are stacked, that’s not genetics - that’s penetration. A properly placed intercanopy LED closes that gap fast.

🧩 What it pairs with

The ECO-R Underlight 140W works best alongside high-output LED grow lights in flowering rooms that already deliver strong top-down intensity. It’s a supplemental layer designed to increase consistency - not replace primary lighting.

Pair it with advanced grow light controllers for proper 0–9V dimming integration, and ensure strong air circulation fans are in place to maintain airflow once you start building out lower canopy density.

In commercial hydroponics systems and vertical farming environments, combining overhead arrays with under-canopy LED bars creates a far more balanced light profile across the entire crop.

📦 Technical specs

• Power: 140W
• Voltage Range: 120–277Vac ~ 50/60Hz
• Current: 1.22A (120V) / 0.71A (208V) / 0.68A (220V) / 0.65A (230V) / 0.62A (240V) / 0.56A (277V)
• Max No. of Fixtures (Power & Signal Chaining): 5–12 depending on voltage
• Nominal PPF Efficacy: 2.90 µmol/J (R) / 2.85 µmol/J (W)
• Max PPF Efficacy: 3.3 µmol/J @25% (R) / 3.0 µmol/J @25% (W)
• Max PPF: 406 µmol/s (R) / 399 µmol/s (W)
• CCT: 3000K (R) / 5800K (W)
• CRI: 60% (R) / 82% (W)
• Beam Angle: 150°
• External Control: 0–9V LED Control
• Thermal Management: Passive
• BTU/h: 478
• Dimensions: 1192.2 x 77.6 x 97.4mm
• Weight: 3.05kg
• Protection: Over-Voltage, Under-Voltage, Short Circuit, Over-Temperature
• Working Temperature: 0°C to 40°C (95% RH)
• Storage Temperature: -40°C to +70°C (85% RH)
• IP Rating: IP66
• Warranty: 2 Years

❓ ECO-R Underlight 140W FAQs

What is the ECO-R Underlight 140W used for?

The ECO-R Underlight 140W is a supplemental intercanopy LED designed to light lower plant zones.

It improves light penetration beneath dense canopies, helping growers achieve more uniform development across the entire plant instead of concentrating yield only at the top.

Should I choose 3000K or 5800K?

Choose 3000K for bloom support and lower flower reinforcement.

Select 5800K if you want stronger vegetative structure support or are using it earlier in the growth cycle. Your choice should match your overall lighting strategy.

Can this replace my main grow light?

No - it’s designed as a supplemental fixture.

It works best when paired with overhead LED grow lights to balance light distribution across the canopy.

Is it safe for high-humidity grow rooms?

Yes - it’s IP66 rated.

That means it’s built to handle demanding commercial grow room environments with high humidity and dense plant loads.

🚀 Balance your canopy like a pro

If you’re already investing in quality overhead lighting, don’t leave the lower canopy underpowered.

Add the ECO-R Underlight 140W, tighten up plant uniformity, and turn more of your plant mass into productive yield - not wasted foliage.

Build smarter. Grow cleaner. Upgrade properly.