Replacement Comparison Chart:
Intermatic LC4521
ALR BF120
Tork 50215

Precision Multiple Controls (PMC) Photo Controls provide dusk-to-dawn control of street, parking lot, billboard and security lighting. Mounting types include fixed position mounting, stem mounting and twist lock. With so many different options, Precision and Green Electrical Supply have the right Photo Control sensors for your application.

The Precision Lumatrol Series model number P2275, dusk-to-dawn photocell is designed for use with outdoor security, area lighting or wall packs. The P2275 provides a low cost, reliable control in applications requiring a NEMA twist and lock type plug connection. They operate on 120 volt, turn on in the evening when light levels reach 1-3 footcandles and turn off in the morning when light level readings reach 3-9 footcandles. An integral polypropylene housing with UV protection keeps moisture out and ensures long life. The physical dimensions of the Precision Lumatrol P2275 dusk-to-dawn photocell are 3.07" in diameter by 2.15 high. They carry a One Year Warranty and are gray in color.

Tips To Optimize Photocell Performance

Do not face the photocell into the midday sun. If the photo control is installed on the south side of a building, face the photocell east or west or point the photo control down toward the ground. The best direction to face the photo control is north.

Do not face the photocell where it can see artificial light. Light from windows, signs, street lights, etc., will cause the photo control not to switch on. The photo control should not be positioned so that it sees the light it is controlling (or reflected light - like off of your white siding or white painted soffit overhang). These conditions will cause the light to cycle on and off.

Do not install the photo control with wires up unless there is NO POSSIBILITY of water entering the photo control around the wires. The photo control must be installed in an approved weatherproof box. Do not attempt to caulk around the wires. Installing a Photocell below the box is WRONG! Photocells installed on top of the Box is RIGHT! Any Photo Control installed by the side of the weatherproof box is: ACCEPTABLE!

When you are testing the photocell, be sure to turn on the power (load will come on) and wait up to 5 minutes for the photocell to switch load off. For further testing cover the photo control completely with black tape or another dark material to simulate night conditions. If you can't cover the control with tape, try covering the photo control with the shipping carton to simulate night conditions.

Precision Twist Lock Photocell Sensor Specification Sheet