Vertical farming is one of the fastest-growing segments in agriculture, and lighting is the single most important — and most expensive — component of any vertical farm. Get it wrong, and you’ll waste energy, stress your plants, and lose money on every harvest. Get it right, and you’ll produce consistent, high-quality crops year-round with minimal operating cost.

In this guide, we walk through the complete process of designing and installing a vertical farm lighting system, from planning to first harvest.

Step 1: Define Your Crop and Growth Targets

Before you buy a single fixture, you need to answer three questions:

What are you growing? Leafy greens (lettuce, arugula, basil) need 200–400 μmol/m²/s. Fruiting crops (tomatoes, strawberries, peppers) need 500–900. The crop determines your PPFD target, photoperiod, and spectrum requirements.

How many tiers? Most commercial vertical farms run 4–8 tiers. Each tier is an independent lighting zone. More tiers mean more fixtures but also more production per square meter of floor space.

What’s your daily light integral (DLI) target? DLI = PPFD × photoperiod (in seconds) / 1,000,000. For lettuce, a DLI of 12–17 mol/m²/day is typical. At 300 μmol/m²/s, that means 11–16 hours of light per day.

Step 2: Choose the Right Fixture Form Factor

Vertical farms need slim, low-profile fixtures that fit between tiers without stealing growing height. The ideal fixture is:

• Thin: Under 50mm height to maximize the gap between the light and the canopy below. Koray’s GE35 is just 35mm thick — one of the slimmest commercial fixtures available.

• Lightweight: Under 2 kg per meter to reduce structural load on multi-tier racking.

• Uniform: U0 > 0.9 so every plant on the shelf gets the same light intensity. Poor uniformity means uneven growth and inconsistent harvest quality.

• Efficient: 3.0+ μmol/J to keep electricity costs manageable across hundreds of fixtures.

• IP65 rated: Vertical farms are humid environments with regular fertigation spray. Fixtures must be water and dust resistant.

Step 3: Calculate Fixture Quantity and Layout

For each tier, you need to determine how many fixtures and what spacing achieves your target PPFD. Here’s a simplified method:

1. Measure your shelf dimensions (e.g., 1.2m × 2.4m = 2.88 m²).

2. Check the fixture’s PPFD output at your mounting height (e.g., 300 μmol/m²/s at 20cm distance).

3. Calculate coverage area per fixture from the manufacturer’s photometric data.

4. Divide shelf area by coverage area to get fixture count per tier.

For Koray GE35 (1.2m bars), a standard 1.2m × 2.4m shelf typically uses 4 bars per tier, mounted 15–25cm above the canopy. This delivers 300–400 μmol/m²/s with U0 > 0.9 across the full shelf.

Step 4: Electrical Planning

A 6-tier vertical farm with 20 shelves per tier and 4 fixtures per shelf = 480 fixtures. At 40W per fixture, that’s 19.2 kW of lighting load. Add pumps, HVAC, and controls, and a mid-size vertical farm can draw 30–50 kW total.

Key electrical considerations:

• Circuit loading: Distribute fixtures evenly across circuits. Don’t put all fixtures from one tier on a single breaker.

• Dimming control: Use 0–10V or DALI dimming to adjust PPFD by growth stage. Koray GE35 supports 0–10V dimming natively.

• Photoperiod scheduling: A simple timer or building management system (BMS) controls on/off cycles. Stagger tier start times to avoid peak demand charges.

Step 5: Mounting and Installation

Most vertical farm racking systems (ZipGrow, FarmBot, custom aluminum extrusion) have integrated channels for LED bars. Installation is typically tool-free: slide the fixture into the channel, connect the quick-connect power cable, and secure with the provided clips.

Koray GE35 features an integrated T-slot mounting profile compatible with standard 4040 and 4080 aluminum extrusions — the most common framing in commercial vertical farms. No custom brackets needed.

Installation tips:

• Keep fixtures level — even a 5° tilt creates significant PPFD variation across the shelf.

• Maintain consistent mounting height across all tiers for uniform growth.

• Leave at least 5cm clearance above fixtures for passive heat dissipation.

• Route cables along the rack frame, not across the growing area.

Step 6: Commissioning and PPFD Mapping

Before planting, verify your light levels with a PAR meter. Take readings in a grid pattern (at least 9 points per shelf: 4 corners, 4 mid-edges, 1 center). Calculate the average and the U0 uniformity ratio (minimum PPFD / average PPFD).

Target: U0 > 0.85 minimum, ideally > 0.9. If uniformity is poor, adjust fixture spacing or mounting height. Koray’s engineering team provides PPFD simulation reports for every project, so you can verify expected performance before installation.

Step 7: Ongoing Maintenance

LED fixtures require minimal maintenance, but a few habits extend their life:

• Monthly: Wipe fixture lenses with a damp cloth to remove dust and nutrient spray residue. Even a thin film reduces output by 5–10%.

• Quarterly: Check cable connections and dimming function. Verify PPFD hasn’t drifted more than 5% from baseline.

• Annually: Full PPFD remapping. Compare to commissioning data to track lumen depreciation.

With proper care, quality LED fixtures like Koray’s GE35 (rated L90 at 50,000 hours) will deliver consistent performance for 8+ years at 16 hours/day operation.

Why Koray for Vertical Farming?

Koray has supplied LED lighting to vertical farms across Asia, Europe, and North America since 2009. Our GE35 series was designed specifically for multi-tier growing: 35mm ultra-slim profile, 4.0 μmol/J efficacy, U0 > 0.9 uniformity, IP65 waterproof, and 0–10V dimming. Backed by 200+ patents and tested in our own 2,800 m² growing facility.

Planning a vertical farm? Get a free lighting design from our team at koraylights.com. We’ll calculate your PPFD targets, fixture layout, and projected energy costs — no obligation.