Pilot Lights

A pilot light, also known as a power indicator light or pilot lamp, provides visual feedback on the operating status of a machine or industrial process. Status changes are communicated through colour, steady illumination, or momentary flashing, with red and green being the most common colour convention. Most pilot lights are panel-mounted on the machine itself or on an accessible control panel for easy visibility during operation.

RS Hong Kong provides a wide selection of pilot lights available as complete units or pilot light heads, in LED, incandescent, and ATEX-certified hazardous-area types. Our range covers multiple colours, cutout sizes, voltage ratings, and IP protection levels to suit different industrial and commercial applications.

Types of Pilot Lights

Pilot lights are commonly available in LED, incandescent, and hazardous area certified variants:

LED Pilot Lights

An LED pilot light is widely used in new installations and panel upgrades. LEDs are semiconductor light sources that operate on DC voltage and draw less current than incandescent alternatives.

Key characteristics include:

• Long Lamp Life: LED versions typically last many thousands of hours, with select models rated up to 30,000 hours, reducing replacement frequency on production panels.
• Compact Form Factor: The small light-emitting element enables panel-mount designs with standard 22mm cutouts, fitting into existing control panel layouts.
• Voltage Range: Available in a broad range of operating voltages, including popular 12V LED configurations for 12V DC control circuits, through to 24V AC/DC and higher voltage variants.
• Colour Options: LED types are available in red, green, blue, amber, and white, with consistent colour output throughout the product's life.

Incandescent Pilot Lights

Incandescent indicator pilot lights use a wire filament that glows when current passes through it.

Key characteristics include:

• AC and DC Compatibility: Unlike LEDs, incandescent lamps operate directly on an AC or DC supply, making them a straightforward replacement in older control panel installations.
• Higher Heat Output: Incandescent lamps generate more heat than LED lamps and have shorter operating lifespans, increasing maintenance requirements in high-cycle applications.
• Availability as Replacement Parts: Incandescent pilot lights remain available as direct replacements for existing panel indicator positions where LED retrofitting is not practical.

Hazardous Area Pilot Lights

In environments where explosive gases, combustible dust, vapours, or mists are present, standard pilot lights are unsuitable. ATEX-certified hazardous area pilot lights are specifically designed and tested to prevent the light fitting from becoming an ignition source.

Key characteristics include:

• ATEX Certification: Hazardous area pilot lights carry ATEX certifications, confirming compliance with the strict design and safety requirements for use in Zone 1, Zone 2, Zone 21, and Zone 22 classified areas.
• Robust Construction: Housings are typically manufactured from corrosion-resistant materials, such as stainless steel or reinforced polyamide, and are rated to IP66 or higher to resist dust and high-pressure water jets.
• LED Light Source: Most modern hazardous-area variants use LED technology for a long service life and reduced heat output, minimising maintenance requirements in difficult-to-access locations.

Common Applications of Pilot Lights

Pilot lights and pilot lamps are used across a wide range of industrial and commercial environments, including:

Industrial Machinery and Automation

On production lines and in machine operator interfaces, a red pilot light typically signals an active or fault condition, while a green pilot light indicates normal or safe operation. Pilot lamps are mounted on motor control centres, conveyor systems, pump panels, and automated assembly equipment to give operators immediate visibility of machine status without needing to access internal wiring or instrumentation.

Commercial and Building Services

In commercial buildings, pilot lights are installed in HVAC control panels, electrical distribution switchboards, and building management system interfaces to indicate power availability, alarm conditions, or system mode. A blue pilot light is commonly used in HVAC applications to indicate cold or cooling conditions, providing quick visual differentiation across multi-function panels.

Transportation and Vehicle Systems

Pilot lamps are used as dashboard and instrument panel indicators in commercial vehicles, forklifts, and industrial handling equipment, providing operators with real-time feedback on system status, fault conditions, and operational mode without diverting attention from the task.

Hazardous and Outdoor Environments

In food processing facilities, chemical plants, and outdoor control enclosures, pilot lights with IP67 ratings or above provide complete protection against dust ingress and water immersion. These ratings make them suitable for washdown environments, outdoor panels, and process areas where regular exposure to liquids and particulates is expected.

Buy Pilot Lights from RS Hong Kong

RS Hong Kong is a trusted pilot light supplier selling a wide selection of LED, incandescent, and ATEX-certified hazardous area models online. We offer products from leading brands, including RS PRO, Schneider Electric, and Eaton. Browse by colour, voltage, cutout size, and IP rating to buy the right indicator pilot light for your application.

You can also add push-button switches, pilot light heads, emergency push buttons, and beacon lights to a single transaction, making the ordering process more convenient.

For complete information on delivery methods and fees across Hong Kong, please refer to our Delivery page.