{"product_id":"esp-duceri-3w-led-non-maintained-self-test-emergency-downlight-white","title":"ESP Duceri 3W LED Non-Maintained Self-Test Emergency Downlight - White","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe ESP Duceri is a 3W LED non-maintained emergency downlight kit with a self-test function that automatically verifies battery and LED status at set intervals. The fitting houses a high-power 3W LED behind an interchangeable lens—supplied with both open-area and corridor lens options—and runs from a 3.6V 1800mAh nickel-cadmium battery providing 3 hours of emergency illumination when mains power fails. The open lens delivers 147 lumens; the corridor lens delivers 138 lumens.\u003c\/p\u003e\n\u003cp\u003eNon-maintained operation means the LED only illuminates during power failure, making this fitting suitable for escape routes, stairwells, corridors and fire exits in commercial, retail and residential buildings. The self-test function runs scheduled checks without manual intervention and uses a green LED indicator on the front face to signal charge status and any fault conditions. The IP44 rating allows installation in areas subject to moisture ingress such as bathroom corridors or covered external walkways.\u003c\/p\u003e\n\u003cp\u003eThe white polycarbonate housing measures 335mm wide by 230mm deep with a 65mm surface-mount depth, though a flush-mount kit is available separately for recessed installation. The fitting can be mounted on ceilings or walls and includes charge and discharge protection circuitry to extend battery life. Built-in compliance with BS EN 60598-2-22 and BS EN 62034 standards ensures the fitting meets UK emergency lighting regulations for commercial premises.\u003c\/p\u003e\n\u003cp\u003eThe 5500K colour temperature produces a cool white output that maintains visibility during emergency evacuation without adding warmth or colour cast to escape route signage. The fitting weighs 0.4kg and fits standard UK wiring with loop-in\/loop-out terminals behind the housing for daisy-chained installation across multiple emergency points.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Net Weight (KG)\u003c\/td\u003e\n\u003ctd\u003e1.08\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Gross Weight (KG)\u003c\/td\u003e\n\u003ctd\u003e1.23\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Gross Weight (KG)\u003c\/td\u003e\n\u003ctd\u003e12.3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Length (mm)\u003c\/td\u003e\n\u003ctd\u003e335\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Width (mm)\u003c\/td\u003e\n\u003ctd\u003e230\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Height (mm)\u003c\/td\u003e\n\u003ctd\u003e65\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Length (mm)\u003c\/td\u003e\n\u003ctd\u003e375\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Width (mm)\u003c\/td\u003e\n\u003ctd\u003e610\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Height (mm)\u003c\/td\u003e\n\u003ctd\u003e190\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch5\u003eDownloads\u003c\/h5\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/products_EMST3WMSDL_datasheet.pdf\" target=\"_blank\"\u003eProduct Specification Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/manual_EMST3WMSDL.pdf\" target=\"_blank\"\u003eProduct Manual\u003c\/a\u003e\u003c\/p\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does non-maintained mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNon-maintained operation means the LED only lights up when mains power fails. During normal operation the fitting remains dark and only the green indicator LED shows charge status. This differs from maintained fittings, which stay lit continuously and switch to battery during power failure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the self-test function work?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe fitting runs automated tests at scheduled intervals to verify battery charge level and LED function. If a fault is detected, the green indicator LED changes state to signal the issue. This removes the need for manual monthly or annual testing required by non-self-test emergency lights.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between the open and corridor lens?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe open lens spreads 147 lumens across a wider area for open-plan spaces, stairwells or large corridors. The corridor lens focuses 138 lumens into a narrower beam pattern for long narrow corridors or walkways where concentrated forward throw is needed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this be recessed into the ceiling?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe standard fitting is surface-mount with a 65mm depth. A separate flush-mount kit is available from ESP to recess the fitting into ceiling voids where a cleaner profile is required.\u003c\/p\u003e","brand":"ESP","offers":[{"title":"Default Title","offer_id":45294145306891,"sku":"EMST3WMSDL","price":47.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/EMST3WMSDL_0c7cbd98-b854-4124-9223-67e4d405439e.jpg?v=1714668665","url":"https:\/\/niori.co.uk\/products\/esp-duceri-3w-led-non-maintained-self-test-emergency-downlight-white","provider":"Niori","version":"1.0","type":"link"}