Chihiros WRGB II Pro Review: Worth It for a Planted Tank?
A researched Chihiros WRGB II Pro review: output, app control, sizes, and the honest reason a powerful light causes as many problems as it solves.
One of the strongest planted-tank lights you can buy, and the reason strength alone will not grow you a carpet.
The verdict: Buy the WRGB II Pro if you are running injected carbon dioxide, dosing fertiliser and want demanding carpeting plants and deep reds to actually colour up. Skip it if your tank is low tech with no carbon dioxide, because at this output you will grow algae faster than plants and a cheaper light would have been kinder to you.
Chihiros WRGB II Pro LED Aquarium Light, 60 cm
~$386
A full-spectrum RGB planted-tank light with Bluetooth control and independent red, green and blue channels.
Check price on AmazonSpecifications
| Type | Full-spectrum RGB planted aquarium LED |
|---|---|
| Peak output | Up to 11,170 lumens across the range |
| Control | Built-in Bluetooth with the My Chihiros app, independent red, green and blue channels |
| Scheduling | Programmable sunrise and sunset cycles |
| LED count | 30 to 120 LEDs depending on model |
| Power draw | 37 to 138 W depending on model |
| Mounting | Adjustable stainless steel legs |
| Sizes | Models covering tanks from 30 cm to 140 cm (11.9 to 55.1 inches) |
| Approx. price | Around $386 for the 60 cm model |
Specifications above come from Chihiros's published product information. Treat pricing as approximate, since Amazon pricing moves.
What it does well
- Genuine RGB channel control rather than a fixed spectrum, which is what makes reds read as red instead of brown.
- Enough output to grow carpeting plants at depth, which is where most mid-price fixtures quietly give up.
- Sunrise and sunset ramping, so the tank is not switched from dark to full intensity in one step.
- Adjustable stainless legs sit cleanly on a rimless tank, which is the kind of tank this light is designed for.
- The range spans small nano tanks to 140 cm, so the same control app carries across a whole fish room.
Where it falls short
- Output this high is a liability without injected carbon dioxide and consistent fertiliser dosing. Light drives plant growth only as far as carbon and nutrients allow, and the surplus goes to algae. That is not a fault of the fixture, but it is the reason most people who buy one are disappointed.
- Control is Bluetooth, not networked, so scheduling changes need you within range of the tank rather than on your phone from anywhere.
- It is expensive enough that on many builds it costs more than the aquarium underneath it.
- A powerful fixture over an open-top rimless tank means faster evaporation and more chance of a jumper, so plan for topping up and for a mesh lid if your fish are inclined to leave.
- There are several models in the range with very different output. Buying the wrong length is an expensive mistake, and the naming is easy to misread.
What owners report
Published owner reviews are strikingly consistent on colour rendition. Keepers describe the difference in how red plants and fish photograph and look in person as the reason they upgraded, and the RGB channel mixing is what they credit. Build quality and the legs come up positively as well, especially on rimless tanks where a bracket-mounted fixture would look wrong.
The critical reports are worth taking seriously and they fall into two groups. The first is algae, from keepers who ran the light at high intensity on a tank without carbon dioxide injection. The second is the app, where owners describe the Bluetooth pairing as occasionally awkward and the interface as unpolished. Neither group is complaining about the light output itself.
Setting intensity and photoperiod, not just buying watts
The mistake that costs people money here is treating light as something you buy once rather than something you balance. Work out what your tank actually needs with the lighting calculator and start well below full intensity, around half, on a six to seven hour photoperiod. If you are injecting carbon dioxide, the CO2 calculator gives you a target injection rate to match, and the fertilizer dosing calculator covers the third leg. If you are unsure whether you need a fixture at this level at all, planted LED versus basic LED aquarium light is the honest place to start, because plenty of good-looking tanks run on far less light than this.
Who it suits
- High-tech planted tank keepers running injected carbon dioxide and a dosing routine.
- Aquascapers who care about colour rendition and want reds and greens to separate properly.
- Anyone with a rimless tank where a bracket-mounted fixture would spoil the look.
Who should skip it
- Low-tech and no-carbon-dioxide tanks, which will fight algae rather than grow plants at this output.
- Fish-only tanks, where a far cheaper fixture gives you the same view.
- Reef keepers, since this is a freshwater planted spectrum, not a coral-growth spectrum.
Alternatives worth considering
Fluval Plant 3.0 LED Planted Aquarium Lighting, 46 W, 36 to 46 in
~$222
Considerably less money for a programmable full-spectrum fixture with preset habitat modes and extendable brackets. Less raw output and less colour control, which on a medium-light planted tank is a fair trade rather than a compromise.
Check price on AmazonChihiros RGB Vivid Mini LED Aquarium Light
~$367
A 75 W RGB fixture rated at 5,000 lumens for tanks 15.7 to 23.6 inches wide, available as a pendant. Choose it when you want the light hung from above rather than standing on legs.
Check price on AmazonFinnex Planted+ 24/7 Aquarium LED Light, 3.0 Series, 48 in
~$130
A 48 inch fixture with true 660 nm deep red diodes, programmable sunrise and sunset and a high colour rendering index, for a third of the money. It gives up app control and peak intensity but grows plants well on a medium-light tank.
Check price on AmazonKeep reading
- Planted LED vs basic LED aquarium light
- Lighting calculator
- Best LED aquarium lights
- Fluval Plant 3.0 review
- FZONE Pro CO2 regulator review
This review draws on published specifications, manufacturer figures and the consensus of verified owner reviews. We have not tested this product ourselves, and we say so rather than implying otherwise. As an Amazon Associate we earn from qualifying purchases.
Frequently Asked Questions
Is the Chihiros WRGB II Pro too strong for a low-tech tank?
Usually, yes, if you run it near full intensity. Light sets the pace of plant growth, but plants can only use that light as fast as carbon and nutrients allow. On a tank without injected carbon dioxide, the surplus energy goes to algae instead. You can absolutely use one on a low-tech tank by running it at a low percentage on a short photoperiod, but if that is your plan, a cheaper fixture would have done the same job.
Chihiros WRGB II Pro vs Fluval Plant 3.0: which should I buy?
The Fluval Plant 3.0 is the better buy for a medium-light planted community tank: it is programmable, full spectrum, mounts on a rimmed tank with extendable brackets and costs considerably less. The Chihiros is for high-tech tanks where you want carpeting plants and accurate reds, and where independent red, green and blue channel control genuinely changes the result. If you are not injecting carbon dioxide, take the Fluval.
Do I need carbon dioxide injection with a light this powerful?
If you intend to run it at high intensity, effectively yes. Strong light without carbon dioxide is the classic recipe for an algae outbreak in a planted tank, and it kills more plans than it grows plants. The three things have to move together: light, carbon and nutrients. Our CO2 calculator will give you an injection target to match your tank volume and light level.
How long should the light be on each day?
Six to seven hours is a sensible starting point for a planted tank, and it is usually better to start short and low. Longer photoperiods do not make plants grow proportionally faster, but they do give algae more opportunity. Use the ramping feature so the tank comes up gradually, then adjust intensity over several weeks while watching for algae on the glass.
Will this light work on a reef tank?
No. This is a freshwater planted spectrum. Corals need a spectrum weighted heavily toward blue and violet wavelengths, which is why reef fixtures look so different. For a reef you want a purpose-built coral light such as an AquaIllumination Prime 16 HD, not a planted fixture turned blue.
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