Motion responsive lighting built on the Roma Select platform

KSR Roma Select KSRSF402 is the microwave sensor version of the current Roma Select round bulkhead range. It takes the same flexible lighting platform used in the standard KSRSF400 and adds integral sensor control for spaces where full time operation is not the best answer. That makes it a useful option for circulation areas ancillary spaces and service routes where automatic switching can reduce energy use and improve practical day to day operation.

The fitting offers selectable outputs of 9W 14W and 18W together with selectable colour temperatures of 2700K 3000K 4000K 5000K and 6000K. KSR lists light output up to 2135 lumens at 18W 4000K. At the lower settings it can be configured for softer lower level lighting in quieter areas while the higher settings allow the same fitting to cover brighter access routes and shared spaces.

Why the microwave sensor matters

The main reason to choose KSRSF402 over the standard Roma model is the sensor functionality. KSR states that the microwave sensor is a motion activated switch that turns the light on when movement is detected and then holds it on for the selected period. The current installation guidance also confirms adjustable detection area hold time and daylight sensor settings. That gives installers a more tailored level of control than a simple on or off presence feature.

KSR also notes that the sensor can detect movement through certain materials and advises reducing the detection area if nuisance triggering occurs. Recommended installation guidance is provided with a stated wall mounting height of 1.5m and ceiling mounting height of 3m. For buyers that means the fitting is not just sensor equipped in name. It is intended to be adjusted on site to suit how the space is used.

Core Roma Select lighting flexibility

Sensor control would be less useful if the fitting still forced you into one fixed output and one fixed colour temperature. KSRSF402 avoids that by keeping the full Roma Select switching platform. Colour can be set from warm 2700K through to cool 6000K and output can be stepped from 9W to 18W. That helps the same fitting serve everything from a softly lit residential circulation area to a brighter working route in a commercial back of house setting.

This flexibility can also simplify stock control. Instead of carrying several separate sensor bulkheads in different CCT and wattage variants you can hold one core model and set it at second fix. For contractors and maintenance teams that is a practical commercial advantage rather than just a specification feature.

Robust build for general purpose use

The current Roma Select data sheet lists a polycarbonate body polycarbonate diffuser and ABS rim. KSR rates the fitting at IP65 and IK10 which gives it a strong position for more demanding service environments. It is wall or ceiling mountable and suitable for BESA box mounting. Side conduit entry and rim knockout points also support more flexible cable entry in surface installations.

Dimensions are 315mm diameter and 72mm depth which keeps the fitting compact enough for common circulation use while still giving it a solid presence. The fitting sits within a broader family that also includes standard emergency and corridor function versions plus the KSRSF411 chrome rim accessory. That is useful when a project needs mixed functionality but consistent appearance.

Where KSRSF402 is a strong fit

KSRSF402 suits stairwells corridors landings service areas storage routes and other intermittently occupied spaces where it makes sense for the light to respond to people rather than run unnecessarily. It is also a sensible choice for upgrades where a basic switched bulkhead is being replaced with a more efficient fitting but the project still needs a straightforward hardwired surface luminaire rather than a networked control system.

Overall KSRSF402 is a smart practical bulkhead for buyers who want robust general lighting with integrated movement led control. It keeps the strengths of the Roma Select range which are flexibility durability and straightforward installation while adding sensor features that can make the fitting better matched to real building use.

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