Chihiros WRGB II and the Light That Serious Aquascapers Actually Use

# Chihiros WRGB II and the Light That Serious Aquascapers Actually Use I wasn’t looking to spend three hundred quid on a light. I was perfectly happy with my clip-on LED that cost me thirty pounds on Amazon and had kept my Java ferns alive for eighteen months without complaint. But then I started following aquascaping accounts on Instagram, started seeing what proper planted tanks could look like, and made the mistake of visiting a proper aquascaping shop.

Three weeks later, a Chihiros WRGB II arrived at my door, and my tiny flat setup was about to get very serious indeed. That was eight months ago. I’ve since added two more WRGB II units to different tanks, convinced three friends to buy them, and started understanding why every serious aquascaper I know runs some version of this light.

It’s not just about the output, though that’s part of it. It’s about what happens when you give plants exactly the spectrum they’re actually asking for. | **Feature** | **WRGB II 60** | **WRGB II Pro 60** | |————-|—————-|———————| | Power Consumption | 67W | 74W | | Light Output | 4500 lumens | 6630 lumens | | LED Count | 60 LEDs | 60 LEDs | | Max Glass Thickness | 10mm | 10mm | | Price Range | £280-320 | £350-400 | | Our Rating | 9/10 | 9.5/10 | ## The WRGB Revolution Chihiros didn’t invent LED aquarium lighting, but they might’ve been the first company to properly understand what planted tanks actually need.

The WRGB series launched in China around 2018 and made its way to European hobbyists through specialist retailers who recognised something different about the approach.

Instead of throwing more white light at plants and hoping for the best, Chihiros built their reputation on precise spectrum control using dedicated white, red, green, and blue channels. The WRGB II is the refined version of that concept. Where the original WRGB established the principle, the WRGB II solved the practical problems.

Better heat management, more intuitive controls, improved mounting systems, and most importantly, the option to run it all through their app without needing a separate controller. The WRGB II Pro takes that foundation and delivers up to 50% more power than the original WRGB 2 (Chihiros EU), which puts it firmly in the territory of lights that can grow anything you throw at them. What makes this different from every other aquarium light I’ve used is the granular control over individual colour channels.

Most LED lights give you brightness control and maybe a few preset modes. The WRGB II gives you independent sliders for white, red, green, and blue, plus the ability to program custom schedules that transition between different spectrum combinations throughout the day. It’s the kind of control that makes you realise how crude most aquarium lighting actually is. ## What Makes It Special The first thing you notice when you unpack a WRGB II is the build quality.

The housing is aluminium with proper heat sinks running the length of the unit. The mounting system uses adjustable legs that grip tank rims up to 10mm thick (Backwater Aquatics) without any wobble or flex. This isn’t cheap plastic with stick-on LEDs.

It feels like equipment that’s meant to run for years. The LED array itself is where things get interesting. The 60cm model packs 60 LEDs (Backwater Aquatics) arranged in a pattern that delivers remarkably even coverage across the tank footprint.

I’ve measured PAR readings at different points under my 60cm unit, and the variation from centre to edge is maybe 15%. Compare that to most budget lights where you get hot spots in the middle and shadows at the corners. But the real magic happens when you start adjusting the spectrum.

Red channel cranked up brings out colours in plants that I never knew were there. My Alternanthera reineckii went from decent pink to genuinely vibrant crimson. My Rotala rotundifolia developed red tips that had never appeared under any previous light.

Green channel adjustment affects how the entire tank looks to your eye, making plants appear more natural or more saturated depending on your preference. The white channel provides the baseline illumination, and this is where you can see the quality of Chihiros’ LED selection. The white isn’t that harsh, cold white you get from cheap fixtures.

It’s a warmer, more natural tone that makes both plants and fish look like they’re supposed to. Blue channel is primarily for shimmer and depth, though some growers swear by blue-heavy periods for promoting compact growth in stem plants. What surprised me most was how different plants respond to different spectrum combinations.

My Cryptocorynes, which had been decent but unremarkable under my old light, started producing leaves with much more pronounced texture and better colour variation. My Monte Carlo carpet, which had been growing but slowly, suddenly took off when I dialled up the red channel during peak hours. The science behind WRGB systems shows that plants use different wavelengths for different photosynthetic processes (aquascaping.academy), and having independent control over those wavelengths means you can actually optimise for growth and colour simultaneously.

The app control is genuinely useful rather than a gimmick. You can set up complex schedules that simulate natural sunrise and sunset, create different spectrum recipes for different times of day, and save settings for different tanks. I run a dawn simulation that starts with deep blue, transitions through pink and orange, peaks with full spectrum daylight, then reverses the process for sunset.

It sounds overwrought, but the visual effect is remarkable, and the plants seem to respond well to the gradual transitions. Performance wise, the standard WRGB II 60 pulls 67W and delivers 4500 lumens (Aqua Club). That’s enough light to grow carpet plants without CO2 injection, though you’ll get better results with petrol.

The Pro version steps up to 74W and 6630 lumens (Green Aqua), which puts it in proper high-light territory. The 45cm Pro model runs 49W and 5000 lumens (Aquarium Gardens), making it one of the most powerful nano lights available. ## The Honest Assessment The WRGB II isn’t perfect, and the first issue is price. Three hundred pounds for the standard 60cm model, closer to four hundred for the Pro version.

That’s serious money for a hobby light, especially when you’re starting out and still figuring out if you’ll stick with planted tanks long term. You can grow plants perfectly well with lights that cost a tenth of this price. The spectrum control, while genuinely useful, has a learning curve.

The app gives you enormous flexibility, but it doesn’t tell you what settings actually work for what you’re trying to achieve. I spent weeks tweaking schedules and colour combinations before I found settings that worked well for my plants and looked good to my eye. If you just want to plug something in and have it work, this might feel unnecessarily complex.

Heat generation is noticeable, especially on the Pro models. The aluminium housing stays warm to the touch during peak output, and that warmth transfers to the water surface. In summer, this pushed my tank temperature up by nearly two degrees, which meant I needed to adjust my heater settings.

It’s not a deal-breaker, but it’s something to factor in if you’re running a temperature-sensitive setup. The mounting system, while solid, assumes you’ve got a rimmed tank or at least something for the legs to grip onto. If you’re running a rimless setup, you’ll need to buy their separate hanging kit, which adds another fifty quid to the total cost.

The legs also make the light sit fairly high above the water surface, which some people find visually intrusive. Reliability has been good in my experience, but I know people who’ve had units fail after 12-18 months of heavy use. Chihiros covers warranties through their dealers rather than directly, which can make getting support more complicated than it should be.

When a three hundred pound light stops working, you want confident that you’ll get it sorted quickly. ## Legacy and Influence The WRGB series basically created the market for serious hobbyist aquarium lighting. Before Chihiros proved there was demand for spectrum control at this price point, your options were either budget fixtures that did the job or commercial systems that cost over a thousand pounds. The WRGB II found the sweet spot between performance and accessibility that brought proper lighting within reach of dedicated hobbyists.

You can see the influence in how every other manufacturer now offers some version of multi-channel spectrum control. Fluval’s Plant 3.0, ADA’s Solar RGB, ONF’s Flat series – they’re all responding to the market that Chihiros created. The idea that aquarium lights should be programmable, app-controlled, and spectrum-adjustable is now standard rather than exotic.

The impact on actual aquascaping has been significant.

Scroll through any planted tank forum or Instagram feed, and you’ll see colours and growth patterns that simply weren’t achievable with the lighting available five years ago. Plants that were considered difficult or colour-finicky are now accessible to intermediate hobbyists willing to invest in proper light. ## The Verdict The Chihiros WRGB II is the light I wish I’d bought first instead of working my way up through three cheaper alternatives.

It’s expensive, but it’s the kind of expensive that makes sense when you realise what you’ve been missing. The spectrum control genuinely transforms what’s possible in a planted tank, both in terms of plant health and visual impact. If you’re serious about growing plants well, if you want colours that pop rather than just survive, if you’re tired of fighting algae because your light spectrum is all wrong, this is worth the investment.

The standard WRGB II is plenty of light for most setups. The Pro version is for people who want to grow anything anywhere or who are running deeper tanks. It’s not for everyone.

If you’re happy with easy plants in a low-tech setup, if budget is tight, if you prefer simple equipment that just works without fiddling, there are better options. But if you’ve caught the planted tank bug and you’re ready to see what proper light can do, this is where serious aquascaping starts. See where this placed in our full ranking of aquarium lights.