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Buyer's Guide
Inter-Canopy Lighting: Complete Guide
How Do I Choose Inter-Canopy Lighting for My Grow Setup?
Inter-canopy lighting fills the dark zones overhead LEDs can't reach: the interior of a dense canopy, lateral branch nodes deep inside a ScrOG net, or the space between rows in a commercial vertical rack. The right format depends primarily on how your plants are trained and how many tiers you're running.
Which Format Fits My Grow?
Three configurations cover most inter-canopy applications:
What Should I Look for in an Inter-Canopy Light?
- Form factor for placement: Ring lights clip around individual stems and distribute light radially to lateral branch nodes. Bar lights thread through training nets or sit between rows on adjustable stands. Choose based on how easily the fixture can be repositioned as plants grow taller through the canopy.
- Spectrum: Red-heavy spectra (600-700nm range) are most common because they drive bud development at lateral sites. Full-spectrum options work equally well for vegetative applications including clone propagation, where more balanced light supports root and leaf development.
- Wattage per zone: Ring lights run 24-96W total across a set of rings. Bar lights run 100-120W for a 2 to 4 foot zone. A good starting point is 30-50W of supplemental light per plant: enough to bring shaded interior nodes into productive range without overdriving them with heat stress.
- Mounting compatibility: Vertical rack systems need fixtures engineered for horizontal side-mounting at row scale. General bar lights may work with custom brackets; purpose-built rack side-lighting systems integrate directly with standard crop row infrastructure and handle daisy-chaining across long rows.
If your grow style calls for a bar light positioned below the canopy rather than within it, under-canopy lighting covers a broader range of bar light formats at higher wattage for that placement approach. For the full case for adding a supplemental light layer, see why supplemental lighting boosts lower bud sites.
Related Guides
- Best Under Canopy Lighting for Indoor Grows
- Why Every Indoor Grower Should Consider Under Canopy Lighting
Frequently Asked Questions
What is the difference between inter-canopy and under-canopy lighting?
Under-canopy lights hang below the plant canopy and shine upward toward lower bud sites from outside the plant structure. Inter-canopy lights are placed inside the canopy: around individual stems, threaded through ScrOG nets, or mounted between tiers in a vertical rack. Inter-canopy placement eliminates light path distance; the fixture sits directly adjacent to the bud site rather than projecting from below.
What wattage do I need for inter-canopy lighting?
For single-plant stem targeting with a ring light, 24-48W per plant is typical. ScrOG growers threading bar lights through a 4x4 net usually run 100-120W total across the zone. The target is supplemental PPFD of 150-300 µmol/m²/s at interior bud sites: enough to bring shaded nodes into productive range without overdriving them with heat.
Can I use inter-canopy lighting alongside my existing overhead LED?
Yes. Inter-canopy lights are supplemental fixtures designed to run alongside a main overhead light, not replace it. Run them on the same photoperiod as your overhead light to avoid disrupting the dark cycle. The overhead handles canopy-level PPFD; the inter-canopy fixture fills the interior zones the overhead cannot reach at adequate intensity.
Are ring grow lights effective for cannabis plants?
Ring grow lights designed for plant use are distinct from photography ring lights. They encircle the main stem and distribute light radially to lateral branch nodes. They work well for large single-plant grows where the lower third is shaded by its own canopy. For ScrOG and multi-plant setups, bar lights tend to offer better coverage across the net because they span a wider horizontal zone rather than targeting a single stem.
What grow styles benefit most from inter-canopy lighting?
The largest gains come from tall single-plant grows over 3 feet at flower, ScrOG setups where a flat canopy shades everything below the net, and multi-tier commercial racks where overhead lighting cannot reach between shelves. Plants trained into a flat, well-spread canopy in a 4x4 or 4x8 tent with a properly dialed overhead light tend to see smaller gains, since the overhead already covers most of the canopy at adequate PPFD.
How does inter-canopy lighting work in a vertical rack system?
In a vertical rack, each shelf's overhead light also acts as the inter-canopy light for the row above it. Purpose-built side-lighting systems mount horizontally between tiers and deliver even coverage along the full row length. For smaller rolling racks with 2-3 tiers, bar lights on adjustable stands mounted between shelves serve the same function at lower cost with more repositioning flexibility as the canopy develops.
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