From 2x2 closet grows to 4x8 commercial rooms — the best LEDs at every wattage and price point, tested by our grow team.
LED grow lights have completely replaced HPS as the go-to choice for indoor growers. Modern Samsung LM301H and LM301B diodes deliver more usable light per watt than any previous technology — and they run cool enough to eliminate most HVAC headaches.
We've tested dozens of lights in our Toledo, Ohio store and grow facility. Our picks below are based on real PPFD readings, efficiency (μmol/J), build quality, and long-term reliability across hundreds of customer grows. Every light on this page is in stock and available to buy — no affiliate links, no lights we don't carry. Whether you're setting up a 2x4 closet grow or a commercial facility, we have the right pick.
Tested and recommended by our expert growers. All in stock and ships to all 50 states.
HLG 350 Diablo
Horticulture Lighting Group
$549 / in stock
Shop HLG 350 Diablo →The grow community favorite. HLG Diablo series dominates online forums for a reason — outstanding PPFD uniformity, rock-solid Samsung diodes, and efficiency that rivals lights costing twice as much. Perfect for 4x4 tents.
AC Infinity IONFRAME EVO6
AC Infinity
$499.99 / in stock
Shop IONFRAME EVO6 →Best smart light on the market. Controls via the AC Infinity app — set dimming schedules, sunrise/sunset simulation, and monitor from your phone. Pairs seamlessly with AC Infinity fans and controllers for a fully automated grow room.
HLG 750 Diablo
Horticulture Lighting Group
$999 / in stock
Shop HLG 750 Diablo →When you need serious flower power. The 750 Diablo pushes 2,000+ μmol/m²/s at 12 inches — more than enough to max out any plant's light saturation point. The go-to for 5x5 tents and serious home growers.
Gavita CT 1930e LED
Gavita
$1,049 / in stock
Shop Gavita CT 1930e →The commercial standard. Gavita is the most-used brand in licensed grow facilities for a reason — bombproof reliability, EL3 controller integration for managing hundreds of lights, and 5-year warranty. If you're running a business, this is the light.
AC Infinity IONBOARD S44
AC Infinity
$379 / in stock
Shop IONBOARD S44 →Best light under $400. The IONBOARD is a quantum-board style light — simple, efficient, reliable. No fancy app features, just raw performance at a price that's hard to beat. Great first light for new growers.
Grower's Choice ROI-F720
Grower's Choice
$1,099 / in stock
Shop ROI-F720 →Premium efficiency meets commercial scalability. The ROI-F720 pushes 2.9 μmol/J — among the highest on the market. Daisy-chain up to 200 fixtures from one controller. Built for growers who want every watt to count.
Side-by-side specs at a glance.
| Light | Wattage | Coverage | Efficiency | Best For | Price |
|---|---|---|---|---|---|
| HLG 350 Diablo | 600W | 4x4 | 2.85 μmol/J | Home growers (4x4) | $549 |
| AC Infinity IONFRAME EVO6 | 500W | 4x4 | 2.85 μmol/J | Smart automation | $499 |
| AC Infinity IONBOARD S44 | 430W | 4x4 | 2.75 μmol/J | Budget growers | $379 |
| HLG 750 Diablo | 750W | 5x5 | 2.85 μmol/J | Large tents | $999 |
| AC Infinity IONFRAME EVO8 | 730W | 5x5 | 2.85 μmol/J | Smart 5x5 setup | $799 |
| Gavita CT 1930e | High output | 5x5 | Commercial-grade | Licensed facilities | $1,049 |
| Grower's Choice ROI-F720 | 720W | 5x5 | 2.9 μmol/J | High-end home/commercial | $1,099 |
| PHOTOBIO MX2 | 680W | 5x5 | 2.8 μmol/J | iLOC controller rooms | $815 |
For most home growers, the HLG 350 Diablo at $549 is the best all-around 4x4 LED — incredible efficiency, proven reliability, and a massive community behind it. If you want smart app control and room automation, the AC Infinity IONFRAME EVO6 at $499 is unbeatable. For 5x5 tents, the HLG 750 Diablo or AC Infinity IONFRAME EVO8. And if you're running a commercial operation, the Gavita CT 1930e is the industry standard for a reason.
What wattage LED do I need for a 4x4 tent?
For a 4x4 tent (16 sq ft), target 480–640 true watts from a quality LED. The HLG 350 Diablo (600W, $549) and AC Infinity IONFRAME EVO6 (500W, $499) are our top picks for 4x4 coverage. Avoid cheap blurple lights — their actual PAR output is far lower than their claimed watts.
Are LED grow lights better than HPS in 2026?
Yes, for virtually all growers. Modern LEDs match or exceed HPS yields while using 30–50% less electricity and producing far less heat. The break-even point on electricity savings is typically 12–18 months. The only reason to choose HPS today is very low upfront budget or already owning HPS equipment.
What does μmol/J mean for grow lights?
μmol/J (micromoles per joule) measures how efficiently a light converts electricity into photosynthetically active radiation (PAR). Good LED lights score 2.5–3.0+ μmol/J. Anything above 2.8 μmol/J is considered high efficiency. The HLG Diablo series, AC Infinity IONFRAME EVO, and Grower's Choice ROI all score 2.8+ μmol/J.
Do I need to dim my LED grow lights?
Not always required, but dimmable lights give you more control. During seedling/early veg stage, run at 40–60% power. During late veg/flower, ramp up to 80–100%. HLG Diablo, Gavita, and AC Infinity IONFRAME all have dimmer controls built in.
What is the best LED grow light brand?
The top LED grow light brands in 2026 are HLG (Horticulture Lighting Group), AC Infinity, Gavita, PHOTOBIO, Grower's Choice, Fluence, and Spec Grade LED. HLG leads for home growers with their Diablo series. AC Infinity wins on smart features and ecosystem integration. Gavita and Fluence dominate commercial grows.
HLG vs AC Infinity grow lights — which is better?
HLG Diablo series lights deliver slightly higher raw efficiency and have a dedicated following among home growers. AC Infinity IONFRAME lights offer app-based smart control, scheduling, and integration with their fan and tent ecosystem. Both use Samsung LM301H diodes. Choose HLG for maximum PAR output per dollar, or AC Infinity if you want a fully automated grow room controlled from your phone.