Best Reef Tank Lights for Corals (2026): Nano to 75 Gallons
The best reef aquarium lights for soft, LPS and mixed reef corals, compared on coverage, published PAR, spectrum, control and how they mount.
Affiliate disclosure: product links on this page go to Amazon or to the maker's own store. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you; links to makers' stores earn us nothing. No retailer or brand sees our picks before they are published or has any say in them. How we choose.
For a 20 to 40 gallon reef, the Kessil A160WE Tuna Blue is the light we would buy. Kessil publishes its coverage plainly: 24 by 24 inches for soft corals and 18 by 18 inches for a mixed reef, with 24 to 30 inches of penetration for most reefs. It draws 40 W at most, tunes from 10,000K to actinic, and has an acclimation mode for ramping up new corals.
Corals need light because of the algae living in their tissue. NOAA explains that most reef-building corals contain photosynthetic cells called zooxanthellae, and that reef corals need clear water so sunlight can reach them. A reef light replaces that sunlight. The picks below cover nano to 75 gallon tanks.
Our top picks at a glance
1. Best overall (20 to 40 gallons)
Kessil A160WE Tuna BlueCoverage: 24 x 24 in soft coral, 18 x 18 in mixed reef (Kessil) · Power: 40 W max · Control: Manual dials, 0 to 10 V external control, Quick Set dawn and dusk · Best for: Soft and LPS corals, small mixed reefs
2. Best app-controlled nano light
Red Sea ReefLED G2 60Coverage: Tanks up to 50 cm (20 in) deep (Red Sea) · Power: 60 W · Control: ReefBeat app · Best for: Nano and small reefs
3. Best value for LPS and mixed reefs
NICREW HyperReef 100 Gen 2 (100 W)Coverage: 24 x 24 in max (NICREW) · Power: 100 W · Control: 5 channels, 2 USB-C control ports (per the listing) · Best for: LPS and mixed reefs up to 24 x 24 in
4. Best budget panel
VIPARSPECTRA V165 Reef Light (165 W)Coverage: About 24 x 24 in (per the listing) · Power: 165 W rated (per the listing) · Control: Two channels, 0 to 100% dimming, timer, remote · Best for: Soft corals and beginner reefs on a budget
| Pick | Coverage | Power | Control | Best for | Buy |
|---|---|---|---|---|---|
| Kessil A160WE Tuna BlueBest overall (20 to 40 gallons) | 24 x 24 in soft coral, 18 x 18 in mixed reef (Kessil) | 40 W max | Manual dials, 0 to 10 V external control, Quick Set dawn and dusk | Soft and LPS corals, small mixed reefs | Amazon |
| Red Sea ReefLED G2 60Best app-controlled nano light | Tanks up to 50 cm (20 in) deep (Red Sea) | 60 W | ReefBeat app | Nano and small reefs | Amazon |
| NICREW HyperReef 100 Gen 2 (100 W)Best value for LPS and mixed reefs | 24 x 24 in max (NICREW) | 100 W | 5 channels, 2 USB-C control ports (per the listing) | LPS and mixed reefs up to 24 x 24 in | Amazon |
| VIPARSPECTRA V165 Reef Light (165 W)Best budget panel | About 24 x 24 in (per the listing) | 165 W rated (per the listing) | Two channels, 0 to 100% dimming, timer, remote | Soft corals and beginner reefs on a budget | Amazon |
Best overall (20 to 40 gallons)
Kessil A160WE Tuna Blue
A compact point-source light with published coverage, a tunable blue spectrum and an acclimation mode.
- Coverage
- 24 x 24 in soft coral, 18 x 18 in mixed reef (Kessil)
- Power
- 40 W max
- Control
- Manual dials, 0 to 10 V external control, Quick Set dawn and dusk
- Best for
- Soft and LPS corals, small mixed reefs
Pros
- Kessil publishes coverage for soft coral and mixed reef tanks
- Acclimation Mode ramps new lights or corals up over a set timeline
- Multiple lights daisy-chain to one controller
- 4 by 2.48 inches, 0.69 lb
Cons
- Point-source light creates shimmer but also shadows; place rockwork with that in mind
- Sold here by a reef retailer, not Amazon itself
Kessil's A160WE is a single compact LED head. Kessil lists a maximum draw of 40 W, a size of 4 by 2.48 inches, a Tuna Blue spectrum running from deep ocean blue to sky blue (10,000K to actinic), and coverage of 24 by 24 inches for soft corals or 18 by 18 inches for a mixed reef. Kessil's coverage guide suggests mounting it 8 to 10 inches above the water for soft corals and 6 to 8 inches for a mixed reef.
Control is manual on the unit, or through 0 to 10 V external controllers such as Kessil's Spectral Controller X, with Quick Set dawn and dusk across six time points and an Acclimation Mode. A 20 gallon long or a 24 inch cube suits one; a 40 breeder takes two.
Kessil puts the A160WE's average penetration at 24 to 30 inches for most reefs, and says mounting several units close together pushes light deeper still. Its spectrum includes a UV blend that Kessil says enhances coral growth and color. Skip a single A160WE if your tank's footprint is bigger than 24 by 24 inches for soft corals or 18 by 18 inches for a mixed reef; use two, or a larger fixture from the coverage table below.
Best app-controlled nano light
Red Sea ReefLED G2 60
A compact 60 W array with PAR published at the surface and at 50 cm, run from Red Sea's ReefBeat app.
- Coverage
- Tanks up to 50 cm (20 in) deep (Red Sea)
- Power
- 60 W
- Control
- ReefBeat app
- Best for
- Nano and small reefs
Pros
- Red Sea publishes 500 PAR at the surface and 100 PAR at 50 cm
- Compact 4.7 by 4.7 inch array
- App scheduling with Red Sea's reef ecosystem
Cons
- Needs the app for programming; Red Sea's page measured it over a 20 inch cube, not a long tank
- Stock is scarce on Amazon
Red Sea lists the ReefLED G2 60 at 12 by 12 by 5 cm (4.7 by 4.7 by 2 inches) and 60 W, with 500 PAR at the surface and 100 PAR at 50 cm (20 inches) depth, and rates it for water up to 50 cm deep. Its published test setup mounted the light 17 cm (7 inches) above the center of a 50 cm cube. Programming is through the ReefBeat app.
That makes it a natural fit for a cube-style nano reef. For a long, shallow tank you would need two.
Best value for LPS and mixed reefs
NICREW HyperReef 100 Gen 2 (100 W)
100 watts of violet and blue-heavy light, five programmable channels and a wide-angle lens for less than the big names.
- Coverage
- 24 x 24 in max (NICREW)
- Power
- 100 W
- Control
- 5 channels, 2 USB-C control ports (per the listing)
- Best for
- LPS and mixed reefs up to 24 x 24 in
Pros
- Enhanced violet and blue spectrum for growth and fluorescence (per the listing)
- Wide-angle optics to spread PAR evenly and cut hotspots
- Fan and redesigned heatsink; several mounting options
Cons
- External controller sold separately for full customization
- Seller's coverage, not a published PAR map in the listing
NICREW's HyperReef 100 Gen 2 is a 100 W fixture with an enhanced violet and blue spectrum, a custom wide-angle optical system meant to even out PAR and remove hotspots, a new fan and heatsink, and five programmable channels, according to its listing. Two USB-C ports connect an external controller, sold separately.
NICREW's own page gives the HyperReef 100 Gen 2 a maximum coverage of 24 by 24 inches at 100 W, from a 9.8 by 6.3 by 1.4 inch body. Its lens spreads light across 120 degrees, up from 90 on the first generation, and the fan stays off at low intensity and speeds up with output and room temperature. With the separately sold controller, NICREW's Pro Set mode shapes dawn and dusk across eight time points.
One HyperReef 100 suits a 24 inch cube or a tank up to 24 inches long; for a 48 inch tank, use two, or NICREW's 150 W (30 by 30 inch) or 200 W (36 by 36 inch) versions. Its 1-year warranty is in the listing, and NICREW says purchases from online marketplaces other than Amazon may not be covered by its warranty.
Best budget panel
VIPARSPECTRA V165 Reef Light (165 W)
A two-channel dimmable panel with a timer, designed for about 24 by 24 inches of coverage.
- Coverage
- About 24 x 24 in (per the listing)
- Power
- 165 W rated (per the listing)
- Control
- Two channels, 0 to 100% dimming, timer, remote
- Best for
- Soft corals and beginner reefs on a budget
Pros
- Dim each channel separately
- Built-in on and off timer
- Listing reminds you to acclimate corals by raising intensity gradually
Cons
- Basic control next to app-driven lights
- Larger panel is harder to hide
VIPARSPECTRA's V165 is a panel light sold for reef tanks, designed for about 24 by 24 inches of coverage according to its listing, with two channels dimmable from 0 to 100 percent, a built-in timer and a remote. The listing sensibly tells buyers to acclimate corals by raising intensity gradually.
For a soft-coral tank on a tight budget, it gets the job done. It is less precise than a Kessil or a Red Sea, and has no app.
What corals need from a light
NOAA's coral tutorial explains that most reef-building corals host zooxanthellae, photosynthetic cells that use sunlight to make sugars and proteins the coral uses. That is why reef lights are bluer and stronger than freshwater lights: blue light reaches deep in the sea, and corals depend on the light their algae can use.
Different corals want different amounts. Soft corals and many LPS (large polyp stony) corals do well under moderate light; SPS (small polyp stony) corals usually want the strongest. Kessil's coverage guide reflects this by publishing a wider footprint for soft corals than for a mixed reef from the same light.
How we chose
- Published coverage or PAR. Kessil publishes coverage by coral type; Red Sea publishes PAR at the surface and at depth.
- Spectrum. Blue-heavy, tunable, with enough white to view the tank.
- Control. Dawn and dusk ramps, acclimation modes and scheduling.
- Fit. Nano cubes to 75 gallon tanks.
Buying guide
Cover the footprint
Size by footprint, not gallons. A 24 by 18 inch tank fits within one Kessil A160's 24 by 24 inch soft coral coverage, but a 48 inch 75 gallon needs two or three lights or one larger fixture. Kessil suggests lower mounting heights for mixed reefs (6 to 8 inches above the water for the A160) than for soft corals (8 to 10 inches).
Acclimate, always
New, stronger light can bleach corals used to dimmer light. Kessil builds an Acclimation Mode into the A160WE, and VIPARSPECTRA's listing tells buyers to raise intensity gradually. Start low and climb over a few weeks.
Heat and power
Modern LEDs run far cooler than older metal halide lamps, but stronger fixtures still add heat. If your reef runs warm in summer, see our chiller guide.
The rest of the reef
Light is one part of a reef system. Corals also need stable salinity (an auto top-off keeps it steady as water evaporates), flow from a wavemaker, and clean water from a protein skimmer. Mix salt water with RO water so tap water impurities do not feed algae under strong light.
Reef light coverage as the makers publish it
Reef light makers publish coverage in different ways: Kessil by footprint and coral type, Red Sea by PAR at a stated depth, NICREW by a maximum footprint. Side by side, their own figures look like this:
| Light | Max power | Maker's coverage figure | Mounting or depth |
|---|---|---|---|
| Kessil A80 | 15 W | 18 x 18 in soft coral; 12 x 12 in mixed reef | 6 to 8 in above the water (soft); 4 to 6 in (mixed) |
| Kessil A160WE | 40 W | 24 x 24 in soft coral; 18 x 18 in mixed reef | 8 to 10 in (soft); 6 to 8 in (mixed) |
| Kessil A360X | 90 W | 24 x 24 in mixed reef; 20 x 20 in SPS | 8 to 10 in (mixed); 6 to 8 in (SPS) |
| Red Sea ReefLED G2 60 | 60 W | 500 PAR at the surface, 100 at 20 in deep | Water up to 20 in (50 cm) deep |
| Red Sea ReefLED G2 115 | 115 W | 500 PAR at the surface, 150 at 20 in deep | Water up to 24 in (60 cm) deep |
| Red Sea ReefLED G2 170 | 170 W | 550 PAR at the surface, 130 at 32 in deep | Water up to 32 in (80 cm) deep |
| NICREW HyperReef 100 Gen 2 | 100 W | 24 x 24 in maximum | Not stated |
Red Sea took its figures in a saltwater tank with a spectrophotometer, each light mounted above the center of a cube as deep as its rated maximum: 7 inches above a 20 inch cube for the G2 60, 8 inches above a 24 inch cube for the 115, and 12 inches above a 32 inch cube for the 170. For a 48 by 24 inch footprint, Kessil's figures point to two A160WEs for soft corals or two A360Xs for a mixed reef; a 48 by 18 inch mixed reef takes three A160WEs.
What to skip
- Freshwater lights over a reef. They lack the blue intensity corals use.
- Running a new light at full power on day one.
- Buying on wattage alone. Compare coverage and published PAR.
Frequently asked questions
What light is best for a reef tank?
One that covers your tank's footprint for the corals you keep. For a 20 to 40 gallon reef we would buy the Kessil A160WE Tuna Blue, which Kessil rates for 24 by 24 inches of soft coral coverage or 18 by 18 inches of mixed reef.
Why do corals need special lighting?
Most reef-building corals host zooxanthellae, photosynthetic cells that make food for the coral from light, as NOAA explains. Reef lights supply the strong, blue-heavy light those cells use.
How long should reef lights be on?
Keep a consistent daily schedule with gradual dawn and dusk ramps. Most reef lights let you program this. When you change lights or add corals, start with lower intensity and raise it over weeks.
How high should a reef light be above the water?
Follow the maker. Kessil suggests 8 to 10 inches above the water for soft corals and 6 to 8 inches for a mixed reef with its A160 series.
Can I use a freshwater LED on a saltwater tank?
For fish-only marine tanks, yes. For corals, no: freshwater lights lack the blue intensity corals need. Use a light made for reef tanks.
Will a new reef light bleach my corals?
It can if it starts at full power. Ramp intensity up over a few weeks. Kessil's A160WE has an Acclimation Mode for exactly this.
Sources
- A160WE Tuna Blue, Kessil
- Choosing Your Kessil, Kessil
- ReefLED G2, Red Sea
- Corals Tutorial: What is Zooxanthellae?, NOAA National Ocean Service
- HyperReef Gen 2, NICREW
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