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        National Light Sources | Dusk-to-Dawn Light Sensor for NLS Floodlights | IP65 Black

        The NLS 20437 is a dusk-to-dawn light sensor for NLS 20430 and 20431 floodlights. The 20437 measures ambient light and switches the connected floodlight on as darkness falls, then off again at first light, without a timer or a manual switch. The housing is black ABS and polycarbonate, rated IP65 for outdoor installation.

        A floodlight left on a manual switch either burns through the night unnecessarily or gets forgotten and leaves the site dark. A dusk-to-dawn sensor ties the fitting to actual daylight instead of a schedule, so it tracks seasonal change without anyone resetting anything. The IP65 rating suits the exposed position the sensor has to occupy to read ambient light correctly.

        Retrofitting light-level control to an installed floodlight normally means adding a separate photocell and finding somewhere to mount it. This sensor is made for the 20430 and 20431 fittings, so the control goes on the light itself rather than as a second device on the wall. At the price of a consumable it is worth carrying for service calls where a customer asks for automatic operation.

        Features

        • Dusk-to-dawn switching — the floodlight comes on as ambient light drops and switches off when daylight returns.
        • Made for NLS 20430 and 20431 — designed as the light sensor option for those two floodlight models.
        • IP65 rated — dust tight and protected against water jets, suited to the exposed position a light sensor needs.
        • ABS and polycarbonate housing — a moulded two-material body rather than a metal one.
        • Black finish — matches the finish of the floodlights it fits.
        • Ambient light control only — the sensor responds to light level, not to movement, so it holds the light on all night.
        • No timer or manual switch needed — switching follows daylight, so seasonal change needs no adjustment.
        • Sold individually — supplied as a single sensor rather than in a pack.
        • Host specific — it is an accessory for those floodlight models and does not fit other fittings.
        • Electrical ratings not published — operating voltage, switching load, and trigger level are not stated on the product page.
        • Fitting method not published — how the sensor mounts to the floodlight is not described, so confirm before ordering for a retrofit.

        Where to use

        • Driveway and entry floodlights — the 20437 gives automatic overnight light without anyone operating a switch.
        • Residential exteriors — pathways, carports, and yards lit from dusk through to dawn.
        • Commercial car parks — automatic operation where the site is unattended at night.
        • Security lighting — continuous overnight illumination rather than movement-triggered bursts.
        • Rural and shed lighting — properties where nobody is present to switch a floodlight on and off.
        • Service call retrofits — adding automatic control to a compatible floodlight already installed.

        The 20437 is an accessory for NLS 20430 and 20431 floodlights only and does not fit other fittings. It responds to ambient light and not to movement, so the light stays on all night rather than switching with activity. IP65 is not submersible, so the sensor is not for immersed or pressure-washed positions. Installation is a licensed electrician's work where the floodlight is connected to mains supply.

        (20437)

        It is a light sensor that enables automatic dusk-to-dawn operation for compatible NLS floodlights.

        It is designed to suit NLS 20430 and NLS 20431 floodlight models.

        It turns the light on when it gets dark and switches it off again when daylight returns.

        Yes. It only runs the light when needed, helping reduce unnecessary energy use.

        No. It only activates the light when ambient light drops to a low level.

        Yes. Sparky Direct stocks the NLS 20437 with fast dispatch and fast delivery Australia wide.

        100-Day Fuss-Free Returns
        We want you to love what you buy—but if you change your mind, that’s okay too. That’s why Sparky Direct offers a 100-day money-back guarantee.

        • Items must be unused, with all parts, accessories, and original packaging.
        • We can’t accept returns if the product is damaged, incomplete, or not in resalable condition.
        • Proof of purchase is required.
        • Return shipping is the responsibility of the customer. 

        If your item isn’t in its original condition, please contact us before returning it—we might save you time and money.

        All products come with a manufacturer’s or supplier’s warranty

        • Warranty starts from the Invoice Date
        • Some suppliers offer in-home warranties and handle claims directly, so you won’t need to uninstall or return the product. Chat with us to check if your product qualifies.
        • Sparky Direct isn’t responsible for losses caused by product failure.
        • Warranties are void if products aren’t installed by a licensed electrician.

        Damaged or Faulty Goods
        If your order arrives damaged or is faulty, let us know within 24 hours.

        • Sparky Direct will pay for return shipping via an emailed return label.
        • If the fault is confirmed, we will send you a replacement item or provide a refund.

        Contact us via our chat to arrange the return.

        Exclusions
        We can’t accept returns for:

        • Items that have been installed, modified, or used
        • Clearance, End of life, Discontinued, or special order items (unless faulty)
        • All PPE Items
        • Goods returned without original packaging or proof of purchase

        How to Request a Return

        1. Contact our customer service team with your order number.
        2. Confirm it’s eligible under our return or warranty policy.
        3. Pack the item securely and return it using a trackable service.
        4. Once we receive and inspect it, we’ll process your refund or replacement.

        Warranty starts from Invoice Date

        Domestic Use: 1 Year
        Commercial Use: 1 Year
        Warranty Method: Return to Sparky Direct

        These specifications and characteristics outline physical, mechanical, electrical details.

        Brand NATIONAL LIGHT SOURCES
        SKU 20437
        Model # 20437
        Barcode # 9336700018115
        Package Weight 0.043kg
        TYPE VALUE
        Type Floodlight
        Brand National Light Sources
        Colour Black
        IP Rating IP65

        Electrical and HVAC products sold by Sparky Direct are intended for installation by licensed and appropriately qualified professionals in accordance with applicable Australian Standards and regulatory requirements. Customers are responsible for ensuring that any product purchased, including any related or associated components, is compatible and suitable for their intended installation and application.

        Sparky Direct does not provide installation advice and does not assess product suitability for individual circumstances unless expressly confirmed in writing. Customers must confirm correct product selection, compatibility, compliance, and suitability with a licensed or appropriately qualified professional prior to purchase.

        Tools sold by Sparky Direct must be used safely and in accordance with the manufacturer’s instructions. Customers are responsible for ensuring they have the necessary knowledge and competence to operate any tool purchased. If you are unsure how to safely or correctly use a tool, do not use it and seek guidance from the manufacturer or a suitably qualified professional.

        Nothing in this clause limits or excludes any rights or guarantees available under the Australian Consumer Law.

        For website terms and conditions https://www.sparkydirect.com.au/terms-of-use

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