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Constant-Current vs Constant-Voltage LED Drivers

Every LED fixture needs a driver, and drivers come in two main output types: constant current and constant voltage. Matching the driver type to...

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Wet, Damp and Dry Location Ratings Explained

Light fixtures are listed for the kind of location they are intended to be installed in: dry, damp or wet. Put a damp-listed fixture...

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Photocell wiring diagram: black lead to Line 1, white lead to neutral on 120, 277 or 347 V or to Line 2 on 208, 240 or 480 V, red lead is the switched load

How to Wire a Photocell for Outdoor Lights: Installation, Sizing an...

A photocell, properly a photocontrol, is usually a three-wire switch that turns outdoor lighting on at dusk and off at dawn. Wiring one is...

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UL 924 scope diagram: emergency equipment such as exit signs, emergency luminaires and unit equipment vs auxiliary equipment such as luminaires with integral battery backup

UL 924 Explained: What the Emergency Lighting Listing Covers

UL 924 is the standard for emergency lighting and power equipment such as exit signs, emergency luminaires and unit equipment. The most useful thing...

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IP65, IP66 and IP67 compared: all dust tight; 5 is a water-jet test, 6 a powerful water-jet test, and 7 temporary immersion up to 1 m for 30 minutes.

IP65 vs IP66 vs IP67: What Ingress Ratings Mean for Lighting

IP65, IP66 and IP67 look almost identical on a spec sheet. The last digit is what separates them, and it describes a different water...

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Side-by-side control wiring: 0-10V uses a polarity-sensitive control pair so every driver gets the same level; DALI uses a powered two-wire bus with two-way data and an address for each driver.

DALI vs 0-10V Dimming: Which Control Protocol to Spec

0-10V and DALI both dim LED drivers over low-voltage control wiring, but they work in opposite ways. 0-10V sends an analog voltage that sets...

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