What Is the Best LED Grow Light for Cannabis?

The best LED grow light for cannabis in most home grows is a 240W to 480W bar-style fixture with Samsung LM301 diodes, a dimmable driver, and a footprint that matches your tent. That power range puts out enough intensity for dense flower, runs cool, and costs less to run than the HPS light it replaces.

Here is the short version before the details.

  • Best overall: HLG 350 Diablo (340W), for a 3x3 or 4x4 tent.
  • Best for app control: AC Infinity IONFRAME EVO4 (320W).
  • Best for 2x4 tents: Spider Farmer SF2000 (200W).
  • Best for 4x4 flower rooms: Mars Hydro FC-E4800 (480W).
  • Best budget pick: ViparSpectra XS1500 Pro (150W).

Best LED Grow Lights for Cannabis Compared

1. HLG 350 Diablo: Best Overall

Horticulture Lighting Group builds lights for growers who care about diode quality. The 350 Diablo pulls about 340W from the wall and runs Samsung LM301H EVO diodes with added deep red, which is the spectrum most cannabis plants want from veg through harvest.

Light spread is the selling point. The board layout pushes photons toward the corners instead of dumping everything in the middle, so a 3x3 canopy flowers without a hot spot in the center.

  • Wattage: about 340W
  • Coverage: 3x3 ft in flower, larger in veg
  • Dimming: onboard knob
  • Best for: growers who want premium diodes and a US-built fixture

The downside is price per watt. It costs more than the budget brands, and there is no app or controller built in.

2. AC Infinity IONFRAME EVO4: Best Smart Option

The EVO4 pairs with the AC Infinity Controller 69, so you can set sunrise and sunset ramps, dim by temperature, and watch power draw from a phone. That matters if you run a sealed room or a tent in a warm spare bedroom.

It uses Samsung LM301H EVO diodes at 320W and a bar layout that spreads light edge to edge. Build quality is high for the price, and the aluminum frame runs cool.

  • Wattage: 320W
  • Coverage: roughly 3x3 ft in flower, 4x4 ft in veg
  • Dimming: app, controller, or onboard
  • Best for: growers who want automation without extra hardware

The catch is ecosystem lock-in. The best features live inside the AC Infinity controller, so a mixed-brand setup loses some of the value.

3. Spider Farmer SF2000: Best for 2x4 Tents

The SF2000 is a 200W board with Samsung LM301B diodes and a Meanwell driver, sized for a 2x4 tent. It is a common first light, and for good reason: the price is low, the driver is replaceable, and the dimmer works.

  • Wattage: 200W
  • Coverage: 2x4 ft in flower
  • Dimming: yes
  • Best for: small tents, single-plant grows, veg rooms

It will not fill a 4x4 in flower. Buy two if you plan to upgrade tent size later.

4. Mars Hydro FC-E4800: Best for 4x4 Flower

The FC-E4800 runs 480W across six bars with Bridgelux diodes and a dimmable driver. Bar lights beat single boards in tall tents because the light comes from several points instead of one panel.

  • Wattage: 480W
  • Coverage: 4x4 ft in flower
  • Dimming: yes, with daisy-chain support
  • Best for: full 4x4 flower rooms on a mid-range budget

Diodes are a step below Samsung LM301 bins, so efficiency is lower. It makes up ground on price and even coverage.

5. ViparSpectra XS1500 Pro: Best Budget Pick

The XS1500 Pro is a 150W board that flowers a 2x2 space for the price of a mid-tier nutrient kit. It dims, it runs cool, and it uses a lens design that evens out the center hot spot common on cheap boards.

  • Wattage: 150W
  • Coverage: 2x2 ft in flower
  • Dimming: yes
  • Best for: beginners, veg tents, supplemental lighting

Skip it if you plan to flower more than one large plant. At 150W it has a ceiling.

What Specs Matter Most When You Compare LED Grow Lights for Cannabis?

PPFD and DLI

PPFD measures the light that lands on the canopy every second, and DLI adds those seconds up across the day. Cannabis in flower does well at 600 to 900 PPFD on a 12/12 schedule, which lands near 26 to 39 DLI.

Ask for a PPFD map at 12 inches rather than one center reading. A map shows whether the corners of your tent get enough light or drop off.

Spectrum

Full-spectrum white with added 660nm red and a touch of far red covers veg and flower in one fixture. Blue-heavy veg lights work too, but you end up buying a second light for flower.

Diodes and Driver

Samsung LM301 series and Bridgelux are the two common diode families in this price range. Meanwell drivers cost more and hold up better over years of 12-hour days.

Heat and Efficiency

LED efficiency is measured in micromoles per joule. Fixtures above 2.5 µmol/J turn more of each watt into photons and less into heat, so you spend less on cooling.

How Many Watts Do You Need for Your Tent Size?

A common target for cannabis flower is 30 to 40 watts of LED per square foot.

  • 2x2 ft (4 sq ft): 120W to 160W
  • 2x4 ft (8 sq ft): 240W to 320W
  • 3x3 ft (9 sq ft): 270W to 360W
  • 4x4 ft (16 sq ft): 480W to 640W
  • 5x5 ft (25 sq ft): 750W to 1000W

Those numbers assume modern diodes at 2.5 µmol/J or better. Older or cheaper fixtures need more watts for the same canopy intensity.

Questions Growers Ask About LED Grow Lights for Cannabis

Do cheap LED grow lights work for cannabis?

Some do. The gap between budget and premium lights shows up in diode binning, driver quality, and how honest the PPFD numbers are. A $90 board with a real PPFD map often beats a $200 light with a padded wattage claim.

How high should an LED sit above the canopy?

Most bar lights hang 12 to 24 inches above the canopy in flower, with power dialed back as needed. Seedlings and clones want more distance or less intensity.

Can one light handle veg and flower?

Yes, if it dims and runs full spectrum. Use lower power and an 18/6 photoperiod in veg, then raise power and switch to 12/12 for flower.

Is an LED grow light worth it for CBD hemp?

Yes. Indoor CBD hemp flower responds to the same light targets as high-THC cannabis, so one fixture covers both. Hemp grown for smokeable CBD flower needs the same 600 to 900 PPFD range at the canopy.

Bottom Line

Match the fixture to your tent size first, then spend up on diode quality and dimming. For a 3x3 or 4x4 home grow, the HLG 350 Diablo is the pick to beat, and the AC Infinity IONFRAME EVO4 wins if you want app control and ramp schedules.

On a tight budget, the ViparSpectra XS1500 Pro flowers a 2x2 space, and the Spider Farmer SF2000 covers a 2x4. Check the PPFD map at 12 inches and skip any light that will not publish one.