If you’re searching for types of grow lights, you’re probably not trying to light a windowsill. You’re trying to make a facility pencil out—greenhouse bays, indoor rooms, vertical racks—where uniformity, operating cost, and serviceability matter as much as peak output.
This guide breaks down today’s grow light types in a way that helps commercial teams choose the right system architecture (top lighting, interlighting, rack lighting) and the right technology (LED vs legacy HID), without turning into a beginner-only explainer.
Why Choosing the Right Grow Light Type Matters
Fixture Type Impacts Yield and Uniformity
In commercial environments, the wrong fixture type rarely fails because it’s “not bright enough.” It fails because it creates uneven PPFD—hot spots under fixtures and weak edges between them.
Uneven light becomes uneven crop: variable size, slower turns, inconsistent quality, and more labor to grade and manage.
The most procurement-friendly way to evaluate this is to insist on PPFD maps at your actual mounting height and layout (not a center-point measurement). FY LIGHTING’s guide on PPFD maps and how to measure grow light intensity lays out what data to request (average/min/max, grid density, and measurement height).
Wrong Light Type Increases Energy Costs
For commercial projects, electricity is usually the largest ongoing cost driver of lighting.
That’s why buyers focus on efficacy (µmol/J)—how many PAR photons you get per unit of energy. The University of Missouri Extension’s Controlled Environment Agriculture grow lights guide explains efficacy (µmol/J) and why higher values typically reduce cost per photon over time.
Different Facilities Need Different Designs
“Grow light types” isn’t just LED vs HPS.
A greenhouse operator often needs supplemental top lighting (and sometimes interlighting) that plays well with sunlight, spacing, and service access.
An indoor farm needs sole-source lighting that balances PPFD targets with HVAC capacity.
A vertical farm needs rack lights that deliver tight uniformity at short mounting distances—while surviving washdown, humidity, and repeated handling.
Main Types of Grow Lights Used Today
LED Grow Lights
LED technology is now the default for modern commercial installations, offering a combination of:
High efficiency (lower $/photon)
Long service life
Lower radiant heat into the canopy (often easing HVAC load)
Dimming and (when needed) spectrum control
Because LEDs come in diverse fixture designs, this section emphasizes overall fixture architecture rather than individual diodes.
If you want a spectrum-oriented baseline, FY LIGHTING’s full spectrum LED grow lights page is a useful reference for how commercial vendors frame white/full-spectrum systems.
HPS Grow Lights
High-pressure sodium (HPS) is legacy HID technology. It’s still used in some commercial environments, particularly where:
Existing infrastructure is already built around HPS
Radiant heat is desirable (e.g., cold-season operation in some regions)
Teams are optimizing around known, stable processes
The tradeoffs are real: higher radiant heat, bulb replacement cycles, and generally lower efficiency than modern LEDs. The University of Missouri Extension guide also summarizes these efficiency and heat differences in a commercial CEA context.
Fluorescent Grow Lights
Fluorescent systems show up mainly in seedling and propagation rooms where:
Mounting distance is very close
Intensity needs are modest
Uniformity at short range is more important than high PPFD
For most production-scale facilities, fluorescent is a niche choice now because modern LED bars can cover the same use case with better controllability and longer service life.
CMH / MH Grow Lights
Ceramic metal halide (CMH) and metal halide (MH) sit in the older HID family.
Some growers still use them, but they’re less common in new commercial projects because they typically bring the same core drawbacks as HID: heat load, maintenance, and less flexibility than LEDs.
Commercial LED Grow Light Types (Most Important Section)
Before you zoom into LED form factors, it helps to keep the high-level technology buckets straight. The point isn’t to relitigate LED vs HPS—it’s to set expectations for heat, maintenance, and controllability.
Grow light technology | Common commercial use today | Practical strengths | Practical tradeoffs |
|---|---|---|---|
LED | Greenhouse supplemental, indoor sole-source, vertical racks | High efficacy, low radiant heat, dimming/spectrum control, long service life | Higher upfront cost; layout and PPFD uniformity design matter |
HPS | Legacy greenhouse bays; some flowering rooms; colder climates | High output; existing infrastructure | Higher radiant heat; bulb replacement; typically lower efficacy than modern LED |
Fluorescent | Propagation and seedlings | Close mounting; gentle intensity | Lower intensity; less common for production canopies |
CMH/MH | Older HID installations | Broad output vs HPS | Heat + maintenance; declining adoption in new commercial builds |
When commercial teams compare commercial LED grow light types, they’re usually deciding on how light is delivered to the canopy.
Below are the most common fixture architectures and what they’re best suited for.
Key Takeaway: Choose the LED fixture type that matches your canopy geometry and installation constraints—then validate it with PPFD maps at the real mounting height.
Bar Style Grow Lights
Bar-style grow lights are the workhorse for many indoor farms and large canopies.
Why commercial teams choose them:
They distribute light across a wider area, which helps with uniformity
They scale well in arrays (layout-based design instead of “one big fixture” thinking)
They’re a practical fit for retrofits where mounting points and wiring routes matter
Where they fit best:
Indoor farms with large, flat canopies
Long benches and multi-fixture layouts where uniformity matters more than hotspot intensity
Top Lighting Fixtures
Top lighting is the classic “overhead” approach: fixtures mounted above the canopy.
Where it fits best:
Single-level indoor grow rooms
Greenhouses using supplemental top lighting
Crops where top-down distribution is sufficient (especially when canopy isn’t excessively dense)
Procurement note: top lighting decisions should be made alongside HVAC and dehumidification planning. Even with LEDs, the system-level heat and moisture balance matters.
Interlighting Fixtures
Interlighting (sometimes called intercanopy lighting) places fixtures within the canopy—typically between rows.
Why it’s used:
Dense vine crops can self-shade; photons from above don’t always reach productive leaf area lower in the canopy
Interlighting targets light where top lighting is geometrically disadvantaged
Where it fits best:
High-wire greenhouse crops like tomatoes and cucumbers
Vine crops where quality and yield are sensitive to lower-canopy light availability
Operational constraint to plan for: interlighting introduces hardware into work zones (labor access, cleaning, and maintenance). You’re trading installation complexity for better distribution.
Rack Grow Lights
Rack lights are designed for multi-layer production—thin profiles, short mounting distances, and high uniformity layer-by-layer.
Where they fit best:
Vertical farming shelves
Lettuce, herbs, microgreens
Propagation and nursery rack systems
In vertical farms, environmental exposure is often harsher than teams expect—high humidity, cleaning routines, nutrient aerosols—so durability and ingress protection should be treated as first-class requirements.
Double-Sided Grow Lights
Double-sided fixtures emit light from both sides to improve coverage around tall or layered canopies.
Where they fit best:
Tall crops and greenhouse rows
Fruiting/vining plants where uniformity is limited by canopy geometry
Projects that want stronger side coverage without installing separate interlighting lines
The real advantage isn’t “more light.” It’s different distribution—more photons reaching where top-only fixtures struggle.
Best Grow Light Types by Facility
Greenhouse Operations
Most greenhouse projects benefit from a mix of:
Supplemental LED top lighting (to stabilize DLI and seasonal production)
Interlighting for dense, high-wire vine crops where top-only distribution leaves productivity on the table
Your greenhouse lighting plan should start with constraints:
Bay structure and mounting points
Row spacing and crop training system
Cleaning routines and humidity levels
Control strategy (photoperiod schedules, dimming zones)
Indoor Grow Rooms
Indoor farms are lighting-first environments: the crop depends on your system.
Typical fits:
High-output top lighting for single-level rooms
Bar systems when uniformity and scalable arrays are priorities
In indoor rooms, the “wrong type” often shows up as HVAC pain: you can hit PPFD targets but lose efficiency once cooling and dehumidification are accounted for.
Vertical Farms
Vertical farms prioritize:
Slim linear rack lights per shelf
High uniformity at short distances
Simple service access across many tiers
Because vertical systems multiply fixture count, small differences in driver reliability, wiring design, and control grouping become big operational differences.
Nursery / Propagation Rooms
Propagation is usually a distinct use case:
Lower-intensity bars or rack fixtures
Short mounting distances
Emphasis on uniformity and gentle dimming control
If your operation runs many SKUs or frequent crop changes, flexibility (dimming ranges and spectrum options) often beats a hyper-specific fixed setup.
Best Grow Light Types by Crop
Leafy Greens
Most leafy-green facilities want:
Rack lighting in vertical farms
Bar-style or top lighting in indoor single-level rooms
The practical focus is uniformity (consistent head size) and predictable cycles—avoid layouts that create edge under-lighting.
Tomatoes
Tomatoes (especially greenhouse high-wire) commonly benefit from:
Supplemental top lighting
Interlighting to reduce lower-canopy light limitation
This is a crop where fixture architecture decisions (top vs interlighting vs double-sided) can matter as much as raw output.
Strawberries
Strawberries can be grown in greenhouse rows, gutters, or indoor systems.
Common fits:
Supplemental top lighting for greenhouses
Purpose-built layouts that manage canopy geometry and worker access (harvest considerations)
Microgreens
Microgreens are typically grown on racks with tight vertical spacing.
Common fits:
Rack lights with uniform coverage
Easy cleanability and durability (because trays move constantly)
How to Choose Between Grow Light Types
Ceiling Height
Ceiling height and mounting distance determine what distribution patterns are possible.
Low clearance pushes you toward LEDs with lower radiant heat and fixture forms designed for close mounting.
Higher ceilings may allow broader beam overlap for better uniformity.
Crop Density
Denser canopies and tighter spacing increase the risk of self-shading.
That’s why vine crops often add interlighting: it changes the photon delivery geometry, not just the headline output.
Humidity Conditions
High humidity, condensation, and washdown routines are common in commercial agriculture.
Treat ingress protection as a spec you buy, not an afterthought.
Power Cost
Power cost is where efficient systems win long-term.
Procurement-friendly way to think about it:
Use efficacy (µmol/J) to estimate operating cost per photon
Use PPFD maps to estimate how many fixtures you really need
Automation Needs
Commercial operations rarely run “lights on/off.” They run schedules, zones, and crop-stage transitions.
If you’re planning dimming groups, photoperiod automation, or centralized management, it’s worth aligning your lighting spec with your control strategy early.
For a spectrum/control-oriented internal reference, FY LIGHTING’s article that discusses grow light controller systems for synchronized modules can help frame what “control integration” means in practice.
Why Many Commercial Growers Upgrade to LED
Lower Energy Use
LED systems typically deliver more usable photons per watt than legacy HID systems. That’s why efficacy (µmol/J) is such a common procurement filter.
Better Control
LED fixtures are typically easier to dim and control in zones—useful for seasonal changes, propagation vs finishing zones, and ramping intensity.
If you’re comparing spectrum options (including the “purple/pink” targeted-spectrum conversation), FY LIGHTING’s red/blue vs white grow lights comparison is a relevant internal deep dive.
Lower Maintenance
Commercial maintenance isn’t just bulb changes. It’s lift time, downtime coordination, and failure risk.
Long-life LED platforms can reduce maintenance burden—especially across high-count vertical farm tiers.
Easier Scaling
LED systems often scale more cleanly because you can extend arrays, add zones, and match expansion phases without rebuilding the entire electrical plan.
How FY LIGHTING Supports Custom Projects
FY LIGHTING works with greenhouse and indoor farming teams that need lighting systems designed around real facility constraints.
Custom Fixture Dimensions
For racks, benches, or custom bays, fixture dimensions often drive uniformity and serviceability.
FY LIGHTING’s modular bar and rack families are designed to support project-specific layouts (especially in vertical farming and long-bed installations).
Spectrum Tuning
Commercial teams often want flexibility—especially when rotating crops or running different stages in the same building.
FY LIGHTING supports full-spectrum and tunable spectrum options (from the platform’s product knowledge base), so you can match the system to your crop plan without locking into a single recipe.
IP65 Waterproof Options
Greenhouses and vertical farms are wet, humid, and frequently cleaned.
FY LIGHTING offers IP-rated fixture options (knowledge base notes IP65–IP66 ranges) to match washdown and condensation exposure.
Group Dimming Control
Large grows typically need zones: different heights, crops, or stages.
FY LIGHTING supports 0–10V dimming and group control approaches (per the product knowledge base), which can simplify commissioning and future expansion.
OEM / ODM Support
If you’re building racks, chambers, or integrated farming systems, OEM/ODM support can matter as much as fixture efficiency—especially when you need consistent supply, documentation, and repeatable builds.
Final Verdict
There’s no single best answer for types of grow lights in commercial agriculture.
The right choice depends on your facility (greenhouse vs indoor room vs vertical racks), your canopy geometry, your environmental constraints (humidity/cleaning), your power cost, and how you plan to scale.
For most new commercial projects, LED systems dominate—not because they’re trendy, but because they let you control operating cost per photon, manage heat more predictably, and match fixture architecture to how your crops are actually grown.
If you want a faster path to a confident selection, start by requesting:
PPFD maps at your mounting height and layout
Efficacy (µmol/J) and electrical specs
IP rating documentation aligned to your cleaning reality
Control/dimming capability details
That evidence will tell you more than any marketing term ever will.
FAQ
What are the main types of grow lights?
The main types of grow lights are LED, HPS, fluorescent, and CMH/MH. In modern commercial projects, LED is usually the leading choice.
Why are LED grow lights popular in commercial farming?
LED grow lights are popular because they offer high efficiency, lower maintenance, lower radiant heat, and better dimming or control options.
What is the best grow light type for vertical farms?
Rack grow lights are usually the best option for vertical farms because they provide high uniformity at short mounting distances.
What is the difference between top lighting and interlighting?
Top lighting shines from above the canopy, while interlighting is installed within the canopy to improve light delivery to lower plant areas.
What grow light type is commonly used for tomatoes?
Tomatoes often use supplemental top lighting together with interlighting, especially in greenhouse high-wire production.
Why does PPFD uniformity matter?
PPFD uniformity matters because uneven light can cause uneven crop growth, inconsistent quality, and more management work.
How do commercial growers choose the right grow light type?
They choose based on facility type, canopy geometry, humidity conditions, power cost, and automation needs.
What should buyers request before selecting a grow light system?
Buyers should request PPFD maps, efficacy data, IP rating documents, and control or dimming details.
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