Pet Supplies · Head-to-head
Fluval Plant 4.0 LED vs Chihiros WRGB II Pro LED Light
Which should you buy? Our verdict on both, pulled from our full The Best Aquarium Lights: 4 Compared (and One to Skip) comparison.
The Fluval Plant 4.0 LED gives most freshwater keepers everything that matters: enough spectrum-correct light for low and medium plants, full 24-hour app scheduling, moisture sealing and brackets that fit the tank you already own. Step up to the Chihiros WRGB II Pro if you run CO2, want carpeting plants to fill in, or care about how red stems actually look.
Fluval Plant 4.0 LED
Buy itThe best all-round balance of plant-usable output, scheduling and build for a normal home aquarium.
- Full spectrum output aimed at plants, so fish colors look natural rather than washed out
- FluvalConnect app programs a full 24-hour cycle with sunrise, sunset, moonlight and per-channel color mixing, no wall timer needed
- Sealed against splashes and moisture, which suits a lid that drips condensation
- Extendable brackets plus riser brackets are in the box, so one size covers a range of tank widths and both rimmed and rimless tanks
- Output sits below a dedicated aquascaping fixture, so very deep tanks or demanding carpet plants will want more
- App-only scheduling means the phone is the remote: there is no full control panel on the unit itself
- Suspension kit is a separate purchase
Chihiros WRGB II Pro LED Light
Buy itThe output and color rendering serious planted tanks need, with app control that lets you dial the intensity back down.
- Genuine high-output fixture sold in sizes from 30 to 120 cm, aimed at carpeting plants and stem plants at depth
- Separate white, red, green and blue channels render reds and greens far more convincingly than a white-plus-blue strip
- MyChihiros Bluetooth app handles ramping, custom curves and per-channel intensity, so you can run it at 40 or 50 percent while a tank matures
- Optional Wi-Fi hub adds remote control on top of the built-in Bluetooth
- Check the maker's water-resistance rating before running it under a dripping lid or near a spray bar
- Easy to over-light a tank with: run it near full power on a new setup and algae arrives quickly
- Stand or hanging-kit options vary, so confirm what is in the box before ordering
Side by side
The 7 criteria below are the ones our full comparison judged every product on, narrowed to these two.
| Fluval Plant 4.0 LED Our pick | Chihiros WRGB II Pro LED Light | |
|---|---|---|
| Our verdict | Buy | Buy |
| Best for | Most freshwater keepers running low to medium light plants who want set-and-forget scheduling and a fixture that survives a wet lid. | High-tech or CO2-injected planted tanks and aquascapes where color rendition and reaching the substrate actually matter. |
| Price tier | $$ · mid-range | $$$ · premium |
| Plant-usable output | Medium to high: covers low and medium light plants | High: aimed at carpets and stems at depth |
| Spectrum and color rendering | Full spectrum, app-tuned color | Independent W/R/G/B channels, strongest reds |
| Scheduling and ramping | Bluetooth app, sunrise, sunset, moonlight | Bluetooth app, custom curves per channel |
| Mounting and tank-width fit | Extendable brackets plus risers included | Adjustable legs, fixed stands or hanging kit |
| Splash and moisture resistance | Sealed against splashes and moisture | Check the maker listing |
| Algae risk if run hard | Moderate, ramping helps a lot | High if you skip dimming, easy to tame in the app |
| Warranty | Check the maker listing | Varies by seller |
Which one is right for you?
Pick the Fluval Plant 4.0 LED if
most freshwater keepers running low to medium light plants who want set-and-forget scheduling and a fixture that survives a wet lid.
Know before buying: output sits below a dedicated aquascaping fixture, so very deep tanks or demanding carpet plants will want more.
Pick the Chihiros WRGB II Pro LED Light if
high-tech or CO2-injected planted tanks and aquascapes where color rendition and reaching the substrate actually matter.
Know before buying: check the maker's water-resistance rating before running it under a dripping lid or near a spray bar.
The bottom line
Our overall pick is the Fluval Plant 4.0 LED - The best all-round balance of plant-usable output, scheduling and build for a normal home aquarium. Choose the Chihiros WRGB II Pro LED Light instead if high-tech or CO2-injected planted tanks and aquascapes where color rendition and reaching the substrate actually matter.
Want the full picture, including the other options we compared and the popular one we'd skip? Read the complete The Best Aquarium Lights: 4 Compared (and One to Skip).