The Cetus downlight range is designed to bring maximum flexibility, efficiency, and ease of use to both new installations and refurbishment projects. Now available in three different sizes, it adapts easily to various applications, covering ceiling cut-outs from 95 to 230 mm while maintaining a clean, consistent appearance across a project. Its recessed depth of only 100 mm allows for installation even in restricted ceiling voids, while the ability to cover cut-out differences of 3–4 cm eliminates the need for retrofit rings, preventing unwanted color variations or additional installation steps. With a minimal design and a powerful performance of up to 3400 lumens, Cetus is ideal for projects requiring both functionality and visual uniformity.
A key feature of the Cetus range is its Lumen Colour Select (LCS) technology, which provides unmatched flexibility for late-stage decision making. Even after installation, users can select between different lumen outputs and color temperatures with just a simple rotation of the inner center plate using a screwdriver. This means project teams can finalize or adapt the use of a space at a later stage without delays or complex modifications. For the S size, outputs of 800 or 1500 lumens can be paired with 3000 K, 3500 K, or 4000 K, while the M and L sizes allow for 2000 or 3400 lumens with the same range of color temperatures. This capability ensures that the lighting remains adaptable to changing needs or redefined uses of a space.
The Cetus MSF variant offers further installation versatility with a twist-and-lock bayonet mount, enabling surface mounting, suspension, or Besa box installation. Available in a compact 180 mm height, it delivers lumen packages of up to 3200 lm and can also be specified with an E3 emergency option. Installation across the range is straightforward, with tool-free spring clip fixing suitable for ceilings between 1–25 mm for the S size and 1–35 mm for the M and L sizes. The pluggable driver design also makes both installation and maintenance quick and convenient.
Built with sustainability and performance in mind, Cetus achieves an efficacy of up to 140 lm/W and offers a long lifetime of L80 50,000 hours. It complies with single-light regulations, ensuring that LED modules and drivers can be replaced by a professional when required, further extending product usability and reducing waste. The luminaire is available with IP44 and IP54 attachments, a choice of fixed or dimmable converters, and optional emergency configurations (E3/E3D).
Constructed from durable die-cast aluminum, the body is paired with high-quality, highly reflective polycarbonate reflectors available in white or satinbrite finishes. These smooth reflectors deliver a wide beam distribution that enhances visual comfort and efficiency. The trim, similar to RAL 9016, ensures a neutral aesthetic suitable for a wide variety of architectural and interior styles. With luminous flux options ranging from 800 to 3400 lm, depending on size and configuration, Cetus is a highly adaptable downlight solution that balances modern design, ease of installation, and long-term sustainability.
https://www.thornlighting.com/en/products/indoor-lighting/downlights/Cetus
