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14 July 2026

How to Choose an Aquarium LED for 30, 60 or 90 cm Tanks

By Published Updated
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Three planted aquariums with LED lights sized for small, medium and long tanks
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Short answer: tank length is a geometry filter, not a product ranking. A useful shortlist also needs exact fixture dimensions, mounting range, output evidence, plant requirements, coverage and electrical documentation.

Compare the right evidence

Tropica explains that wattage is not directly comparable across different light-source types. Source: Tropica: Light.

Tropica presents its own lumen-per-litre framework for Easy, Medium and Advanced plant categories. Source: Tropica: Light.

Use that framework only as attributed manufacturer guidance. It is not a ranking or an independent test of an exact LED fixture.

Use length as a fit checkpoint

Tank labelVerify before shortlisting
Around 30 cmExact fixture length, mounting range and control method
Around 60 cmEnd-to-end coverage evidence and plant layout
Around 90 cmCoverage across the footprint and any documented multi-fixture arrangement

The table is a decision checklist. It makes no claim that one size needs a particular model or output.

Keep electrical evidence separate

HSE workplace guidance says electrical equipment should suit its intended use and operating conditions, including the environment in which it is used. Source: UK HSE: Introduction to electrical safety.

This general principle does not certify an aquarium light. Verify the exact fixture documentation for the intended supply and environment.

Shortlist record

  • Exact fixture model
  • Tank dimensions and water depth
  • Plant-light evidence used
  • Fixture dimensions and mounting range
  • Coverage evidence and stated test conditions
  • Electrical documentation for the intended destination

For the wider decision framework covering plant demand, coverage geometry and control, return to the planted aquarium lighting guide.

Why this is not a “best” list

No exact fixtures were independently compared, tested or ranked for this revision. The offline title, H1 and meta description therefore use a truthful “how to choose” framing. A future ranking would require a defined comparison set, current product evidence, disclosed criteria and independently reviewable results.

Shop the guide

Plan a responsible small-aquarium setup

Confirm real water volume and livestock requirements first, then compare tanks, filtration and maintenance equipment as one system.

Explore Build a Nano Aquascape Shop Aquarium Tanks Compare this starter kit
Useful next step

Products matched to this guide

Selected for relevance to the setup and needs covered above.