Best LED Supplemental Grow Lights for Indoor Gardens
LED supplemental grow lights extend and enhance your indoor growing setup by filling gaps where primary lights fall short. They’re ideal for taller or multi-layer grow tents, greenhouses, and seedling stations where uniform canopy coverage matters. The following five products cover a range of needs—from practical side lighting to high-density UV/IR supplementation—so you can choose based on space, plant type, and growth stage. This guide highlights who each light is best for, why it’s a good pick, and any limitations to consider before you buy.
| Product | Best For | Key Benefit |
|---|---|---|
| AC Infinity IONBEAM S16 | Inter-canopy and tent growers needing broad 16″ bars | Four 16″ bars for expanded coverage and deeper penetration |
| Spider Farmer Glow30 Kit | Four-bar, all-around supplement in greenhouses or tents | Sunlike full spectrum with robust IP65-rated bars |
| VIVOSUN Lumaray 16″ (4-Bar) | Even side lighting for taller canopies | 60% red content to boost yields and flowering |
| GooingTop LED Grow Light | Compact clip-on with adjustable timing for small setups | 4-12 hour timer and flexible positioning |
| VIVOSUN T5 24W 4-Pack | Seedlings and cuttings in grow tents or greenhouses | 5,000K full spectrum with energy-efficient bars |
AC Infinity IONBEAM S16, Full Spectrum LED Grow Light Bars
The IONBEAM S16 uses four 16″ LED bars designed for inter-canopy or supplemental lighting to boost yields. It expands coverage to areas that primary lights can miss and can magnetically mount to a grow tent frame with included steel bars. Best for: growers who need reliable, adjustable side lighting to reach shaded zones in medium-sized tents or greenhouses.
Caution: Magnetic mounting relies on compatible tent frames; verify your setup can accommodate the bars securely.
Spider Farmer Glow30 LED Grow Lights Kit
The Glow30 kit features four 13” LED bars with a sunlike full spectrum and IP65 waterproofing. It provides supplemental coverage for inter-canopy or side lighting, expanding reach to prevent shading and improve uniformity. Best for: setups needing a complete, all-weather supplementation with durable, water-resistant bars.
Limitation: Shorter bars may require closer placement to canopy to avoid light spill or overheating in high humidity, so plan mounting height accordingly.
VIVOSUN Lumaray LED Grow Light Bars 16” (4-Bar)
These side lighting bars aim to improve yields by targeting lower and side foliage. They deliver a sun-like full spectrum with 60% red light to support flowering and fruiting. Best for: grow tents and greenhouses where vertical space allows side fixtures to fill in beneath the main light.
Note: While they boost yields, the emphasis on red wavelengths means they work best when coordinated with the primary lighting schedule for full-spectrum balance.
GooingTop LED Grow Light Clip
The GooingTop clip-on light provides a 6000K white light blend (10 red, 74 white) that mimics midday sun to support indoor plant photosynthesis. It offers a 4-, 8-, or 12-hour timer, with USB or AC power options and a flexible gooseneck. Best for: compact deskside gardens, seedling trays, or small plant collections needing adjustable timing and easy placement.
Limitation: Not ideal as a primary grow light for larger grows; it’s best as a supplementary or targeted light source for smaller setups.
VIVOSUN T5 Grow Lights, 24W (4 x 6W)
This 4-pack of T5 grow lights delivers 5000K full spectrum, designed for seed starting and supplementary lighting. The setup is connective and space-efficient for tents, greenhouses, or hydroponic systems. Best for: seedling stages and propagation where gentle, broad-spectrum light supports rapid germination and early growth.
Limitation: While energy-efficient, the 24W total per strip means extended lighting may be needed for larger mature plants; plan supplement layering if targeting full canopy growth.
Buying Guide: Key Considerations For Selecting LED Supplemental Grow Lights
- Coverage and size: Match bar length and quantity to canopy size and the space between main lights and plant tops. Longer bars reach deeper canopies; consider four-bar configurations for inter-canopy regions.
- Spectrum needs: Full-spectrum (roughly 4000K–6500K) supports vegetative growth, while red-rich spectra (600–660nm) can boost flowering. UV and IR bars offer niche benefits for certain crops but may require stage-based use.
- Durability and protection: In humid environments, IP-rated or waterproof bars reduce wear. Laminated or sealed housings protect diodes and prolong life.
- Mounting and integration: Check mounting options (magnetic, clip, or fixed brackets) to ensure compatibility with your tent or greenhouse frame. Plan for temporary positioning during adjustments.
- Control and timing: Timers and dimming options help synchronize light with plant cycles and other fixtures. SGS or app compatibility can simplify schedule management in multi-device setups.
- Energy efficiency and heat: Higher efficiency reduces electricity use and heat load. Consider passive cooling or heat dissipation features if your space already runs warm.
Frequently Asked Questions
- Do I need supplemental lights if I already have strong main grow lights? Yes, to improve light penetration into the lower canopy and across tall plants, especially in tents or greenhouses.
- How many hours should I run supplemental bars? Typical schedules align with main light cycles; many growers use 4–12 hours of supplemental light per day based on plant stage and photoperiod.
- What wavelength is best for flowering? Red-rich light (around 600–660nm) supports flowering, but a balanced spectrum generally yields the best results across growth stages.
- Are waterproof lights necessary in a grow tent? Not always, but in humid environments or near humid zones, waterproof or sealed bars reduce risk and simplify cleaning.
- Can I mix different brands of supplemental lights? It’s possible if spectra and timing are coordinated; avoid dramatic mismatches in intensity to prevent uneven growth.
- What is the advantage of UV or IR in supplemental bars? UV can enhance certain plant responses and resin production in some crops, while IR can support flowering; use these features strategically rather than continuously.