The right light for a 4x4 grow is 480–640W from a quality LED. Here are the 5 best options at every price point.
The 4x4 tent is the most popular size for home cannabis and indoor plant growers — and choosing the right light makes the biggest single difference in your harvest. A 4x4 tent covers 16 square feet. At 30–40W/sqft for flowering, you want 480–640 watts from a high-quality LED.
Avoid underpowered lights — a cheap 300W blurple LED in a 4x4 will leave the edges of your canopy in shadow. Our picks below all produce PPFD levels above 800 μmol/m²/s across the full 4x4 footprint at reasonable hanging heights.
Tested and recommended by our expert growers. All in stock and ships eligible products to all 50 states.
HLG 350 Diablo
Horticulture Lighting Group
$549 / MSRP
Shop HLG 350 Diablo →Best 4x4 LED overall. American-designed with top-bin Samsung diodes. Even PPFD distribution edge-to-edge with proven commercial reliability.
AC Infinity IONFRAME EVO6
AC Infinity
$499.99 / MSRP
Shop AC Infinity IONFRAME EVO6 →Best smart light. Control dimming, scheduling, and intensity from your phone. No extra controller needed.
Gavita CT 1930e LED
Gavita
$849.99 / MSRP
Shop Gavita CT 1930e LED →If you ever expand to 2+ lights, Gavita EL2 controller dims them all simultaneously. Commercial-grade reliability.
AC Infinity IONBOARD S44
AC Infinity
$379 / MSRP
Shop AC Infinity IONBOARD S44 →Best budget 4x4 light. Full-spectrum Samsung diodes at an unbeatable price. Great entry point for new growers.
Grower's Choice ROI-F720
Grower's Choice
$1,099 / MSRP
Shop Grower's Choice ROI-F720 →Maximum output for serious growers. 720W of top-bin LEDs for massive yields. Built for commercial facilities and ambitious home grows.
Side-by-side specs at a glance.
| Light | True Watts | 4x4 PPFD | Controller | Price |
|---|---|---|---|---|
| HLG 350 Diablo | 600W | ~950 μmol avg | Manual dimmer | $549 |
| AC Infinity IONFRAME EVO6 | 500W | ~900 μmol avg | App + voice | $499.99 |
| AC Infinity IONBOARD S44 | 430W | ~820 μmol avg | Manual dimmer | $379 |
| Gavita CT 1930e LED | 645W | ~920 μmol avg | EL2 RJ45 | $849.99 |
| Grower's Choice ROI-F720 | 720W | ~980 μmol avg | Manual dimmer | $1,099 |
The HLG 350 Diablo is our top pick for most 4x4 growers — outstanding PPFD uniformity at $549. For smart features and app control, grab the AC Infinity IONFRAME EVO6 at $499.99. On a budget? The IONBOARD S44 at $379 punches way above its price. For commercial-grade builds, the Gavita CT 1930e or Grower's Choice ROI-F720 won't disappoint.
How many watts do I need for a 4x4 tent?
For vegetative growth, 240–320W is adequate. For flowering cannabis or high-light crops, target 480–640W from a quality LED. More watts = more yield potential, up to the plant's light saturation point (usually around 1,200–1,500 μmol/m²/s for cannabis).
Can I use two lights in a 4x4 tent?
Yes — two smaller lights (e.g., two 250W LEDs) often produce better canopy uniformity than one 500W light. This approach also gives you flexibility to adjust height independently. HLG and AC Infinity both sell smaller fixtures that pair well.
How high should I hang my LED in a 4x4 tent?
Typical heights: Seedling = 24–30 inches above canopy. Veg = 18–24 inches. Flower = 12–18 inches (check manufacturer specs — high-power LEDs can cause light burn at 12 inches). Always monitor for bleaching on top colas.
What is the best LED grow light for a 4x4 tent?
The HLG 350 Diablo is our top overall pick — 600W of Samsung LM301H power with exceptional PPFD uniformity across the full 4x4 footprint. For smart features, the AC Infinity IONFRAME EVO6 offers app control and scheduling at $499.99. Budget growers should look at the AC Infinity IONBOARD S44 at $379.