- Sku: 16905
Fluval Reef 4.0 Aquarium LED Lights
The Fluval Reef 4.0 LED is a full-spectrum, app-controlled fixture built to grow and color up corals in marine and reef aquariums. Its 25000K spectrum leans hard on deep blues and actinics to drive coral photosynthesis and make fluorescent pigments pop, while the FluvalSmart Bluetooth app programs a natural 24-hour cycle plus preset environment effects like passing clouds and storms. It comes in four sizes to fit tanks from 15 to 61 inches.
Stock it with corals, keep your parameters dialed in with reef supplements, and mix water using a quality salt mix.
Features
- Full spectrum with strong blue and actinic channels at 25000K, tuned for coral growth and fluorescence
- FluvalSmart Bluetooth app: programmable 24-hour cycle, sunrise/sunset, and preset environment effects
- High PAR output to support soft corals, LPS, and SPS at the right size and mounting height
- IP67-rated water resistance
- 50,000-hour LED lifespan, backed by a 4-year warranty
- Adjustable mounting brackets extend to fit a range of tank widths
Choose Your Size
| Fixture size | Fits tank length | Power |
|---|---|---|
| 15-24 in | 15 to 24 in (38-61 cm) | 22 W |
| 23-35 in | 23 to 35 in (58-89 cm) | 32 W |
| 35-49 in | 35 to 49 in (89-124 cm) | 46 W |
| 46.25-61 in | 46 to 61 in (117-155 cm) | 59 W |
The adjustable end brackets span the listed tank length, and the larger sizes deliver more total output for longer, deeper reef tanks.
Specifications
| Brand | Fluval |
| Model | Reef 4.0 LED |
| Type | Full-spectrum reef LED |
| Color temperature | 25000K |
| Spectrum | Customizable, strong blue + actinic |
| Control | FluvalSmart Bluetooth app, programmable 24-hour cycle + preset environments |
| Water resistance | IP67 |
| LED lifespan | 50,000 hours |
| Warranty | 4 years |
| Sizes | 22W / 32W / 46W / 59W |
| For | Marine & reef aquariums |
| Availability | In-store pickup only |
Recommended Pairings
- Corals to grow and color up under the reef spectrum.
- Reef supplements for the calcium, alkalinity, and trace elements corals need.
- Salt mix for consistent, coral-ready water changes.
Frequently Asked Questions
Can the Reef 4.0 grow SPS corals?
Yes, in the correct size and at an appropriate mounting height. It puts out a high-PAR, blue-heavy spectrum that supports SPS, LPS, and soft corals; start corals lower in the tank and acclimate them upward as they adjust.
How do I control it?
Through the free FluvalSmart app over Bluetooth. Program a 24-hour cycle with sunrise and sunset, tune the spectrum, and enable preset environment effects like clouds and storms.
Which size do I need?
Match the fixture to your tank length using the size chart above. The adjustable brackets add some flexibility, but the size whose range brackets your tank length gives the best coverage.
Is it safe over saltwater?
The fixture is IP67-rated against splashes and salt creep. Mount it securely, keep a drip loop on the cord, and wipe off salt periodically as with any reef light.
Have a question?
Fluval Reef 4.0 Aquarium LED Lights
