Chihiros WRGB II Pro vs Week Aqua P900 Pro
Two enthusiast-tier lights for a high-tech planted tank. The Chihiros WRGB II Pro 60 is the aquascaper's default full-spectrum RGB fixture; the Week Aqua P900 Pro adds a UVA channel and a wider 90 cm panel. Here's which suits your scape.
The quick verdict
Both put out serious PAR and render plants vividly, so the choice is about size, spectrum and budget. If you want the most polished app control and the best value on a standard 60 cm scape, the Chihiros WRGB II Pro 60 is the reference. If you have a 90 cm tank and want the extra colour "pop" of a dedicated UVA channel, the Week Aqua P900 Pro is the premium colour-first choice.
| Chihiros WRGB II Pro 60 | Week Aqua P900 Pro | |
|---|---|---|
| Spectrum | Individually-controlled RGB + white | RGB + white + UVA channel |
| Size (this model) | 60 cm | ~90 cm wide panel |
| PAR output | High, drives carpets | Very high, drives carpets |
| App control | Polished My Chihiros app + timer | App with presets; polish trails |
| Colour rendition | Excellent RGB | RGB+UV, reds/pinks glow |
| Light spread | Slim bar over 60 cm | Wide panel, even over 90 cm |
| Price | ≈ $180 | ≈ $260 |
App polish vs UV colour, and size
The Chihiros WRGB II Pro 60 earns its "aquascaper's default" reputation on two fronts: enough PAR to grow demanding carpets and red stems, and a genuinely useful My Chihiros app with sunrise/sunset ramps and a built-in timer that pairs reliably. The Week Aqua P900 Pro is a colour-first panel — its RGB+UVA spectrum makes reds, pinks and greens glow with a depth RGB alone struggles to match, and the wide panel spreads light evenly across a 90 cm scape. Its app and firmware polish trail the biggest brands, and it costs more, but for a long tank where colour rendition is the whole point it's close to reference-grade.
Which should you buy?
Our pick
For a standard 60 cm high-tech scape where app polish and value matter, the Chihiros WRGB II Pro 60 is the one to beat. For a 90 cm tank where maximum colour rendition and even coverage lead — and budget allows — the Week Aqua P900 Pro is the premium pick. Either way, only push the brightness if you're injecting CO2 and dosing ferts, and keep a 6–8 hour photoperiod. Read the full Chihiros WRGB II Pro 60 review and Week Aqua P900 Pro review, or see all aquarium lighting.
Frequently asked questions
Chihiros WRGB II Pro or Week Aqua P900 Pro — which is better?
Both are high-end, app-controlled aquascaping lights with huge PAR. The Chihiros WRGB II Pro 60 is the aquascaper’s default — individually-tuned RGB+white, a polished app and a 60 cm size ideal for a standard scape. The Week Aqua P900 Pro adds a UVA channel for extra colour "pop" and comes in a wider 90 cm panel, at a higher price. Pick the Chihiros for app polish and value; pick the Week Aqua for UV colour rendition on a longer tank.
What does the Week Aqua’s UV channel do that the Chihiros doesn’t?
The P900 Pro adds a UVA channel on top of RGB+white, which makes certain pigments — reds, pinks and some greens — glow in a way RGB alone cannot. It is a colour-rendition and "wow factor" feature rather than a growth one; plants grow mainly on red and blue, which both lights deliver in quantity. The Chihiros renders colour beautifully too, just without the dedicated UV boost.
Are these lights overkill for a low-tech tank?
Yes, for both. Each can push very high PAR, and light that outruns your CO2 and nutrients is the fastest route to algae. If you run low-tech (no CO2), you’d have to dim either heavily and keep the photoperiod short. These are high-tech, CO2-injected aquascaping lights — on a low-tech tank a gentler, cheaper fixture is the smarter choice.
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