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Home
Electrical and Specialty Items
Photocells & Photo Control Switches

Photocells & Photo Control Switches

Locking-Type Mounting
Stem Mounting
Stem and Swivel Mounting
Fixed Position Mounting
Receptacles

Optimize Outdoor Lighting with Photocell Sensors

Take control of your outdoor lighting with a photocell sensor—also known as a dusk-to-dawn control. Photocells automatically turn photocell lights on at sunset and off at sunrise, making them a smart and energy-efficient option for homes, commercial buildings, parking lots, and more.

Our wide range of photocell light sensors are designed for various mounting styles and voltages, including options compatible with LED fixtures. Whether you need to control one light or an entire circuit, 1000Bulbs.com has the right solution for your application.

What Is a Photocell?

A photocell is a light-sensitive sensor that detects ambient light levels to control lighting automatically. When it gets dark, the sensor turns the light on. When daylight returns, the light turns off—eliminating the need for timers or manual switches.

Photocells are widely used in:

Wall packs & flood lights
Street and pathway lighting
Security and perimeter lights
Landscape and signage lighting
Outdoor wall sconces and barn lights

Types of Photocell Mountings

Choose the mounting that best suits your setup:

Locking-Type: Durable, secure, and impact-resistant
Stem Mounting: Simple and direct install
Stem & Swivel: Adjustable angle for better light exposure
Fixed Position: Ideal for controlled fixture alignment
Photocell Receptacles: For modular installations or fixture upgrades

Tip: For optimal performance in the northern hemisphere, mount your photocell sensor facing north to avoid false triggers from direct sunlight.

Voltage Matters

While many photocell lights can operate across wide voltage ranges, the sensor itself must match your system voltage—commonly 120V for residential and 277V for commercial. Using the wrong voltage can damage the photocell or cause it to malfunction.

Frequently Asked Questions (FAQs)

What is a photocell?

A photocell is a light-activated switch that automatically turns lights on at dusk and off at dawn by detecting ambient light levels.

How does a photocell work?

Photocells contain a light-sensitive resistor, often cadmium sulfide. In daylight, electrons flow, keeping the circuit open and the light off. When darkness falls, resistance increases and current flow stops, signaling the light to turn on.

How do you wire a photocell?

Connect the black wire to the power source (line), white to neutral, and red to the fixture (load). Always ensure the power is off before wiring, and match the photocell’s voltage rating to your electrical system.

Are photocells the same as motion sensors?

No. Photocells detect light, while motion sensors detect movement. They serve different functions and can be used together for advanced control.

Is a photocell the same as a timer?

No. Timers turn lights on/off at scheduled times. Photocells react to real-time changes in daylight, making them more flexible and maintenance-free.

Is a photocell the same as a daylight sensor?

Not quite. Photocells control outdoor lights based on darkness. Daylight sensors (or daylight harvesting systems) adjust indoor lighting by dimming when natural light is sufficient.

Does Daylight Saving Time affect photocells?

No. Photocells are light-based, not time-based, so they adjust naturally to seasonal and daylight shifts.

What are the different types of photocell mountings?

Common mounting styles include lock-type, stem, stem & swivel, and fixed position. The right mount ensures proper alignment and weather protection.

Are photocells compatible with LED lights?

Yes, but only if labeled as LED-compatible. Using an incompatible photocell can cause flickering, failure to turn off/on, or premature burnout.

How do I know what voltage photocell to use?

Match the photocell’s voltage (typically 120V or 277V) to your circuit. Incorrect voltage may cause malfunction or permanent damage.

Where should outdoor photocells be positioned?

Ideally, photocells should face north to minimize false readings from direct sunlight. East-facing cells turn on too early; west-facing may turn off late.

Can one photocell control multiple lights?

Yes. A single photocell sensor can manage multiple fixtures as long as they share a circuit. Ideal for wall packs, parking lots, or grouped area lights.

How long do photocells typically last?

High-quality photocells last 5 to 10 years. Lifespan depends on exposure, electrical surges, and proper installation.

What are signs a photocell needs replacement?

Symptoms include:

Lights stay on all day or off all night
Erratic operation
Visible housing damage or lens moisture
No response to light changes

Do photocells require any maintenance?

They are mostly maintenance-free, but periodic cleaning of the sensor lens improves performance. Also ensure mounting remains secure over time.

How can I test if a photocell is working?

Two ways:

Cover the sensor to simulate darkness—light should turn on.
Use a multimeter to test resistance change when exposed to or blocked from light.

Explore our wide selection of photocell sensors today to find the perfect solution for your residential, commercial, or industrial lighting needs. Questions? Call us at 1-888-368-1290 and speak to our lighting experts!