News

Two AC sine-wave diagrams: forward-phase (TRIAC/MLV) dimming removes the start of each half-cycle; reverse-phase (ELV) dimming removes the end of each half-cycle.

TRIAC vs ELV vs MLV Dimmers: Which One Does Your LED Need?

If an LED fixture's cut sheet says "TRIAC," "ELV" or "MLV," it is telling you what kind of phase-cut dimmer it expects. A poor...

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ASHRAE 90.1 Lighting Power Density Allowances by Space Type

If you have ever had a lighting submittal bounced for "exceeds LPD," this is the number that did it. Lighting power density, in watts...

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Title 24 JA10 Low-Flicker Requirements, Explained

There are two moments when JA10 suddenly matters: a submittal comes back rejected, or an inspector asks whether the dimmer and the fixture were...

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Wattstopper LMLS-400 closed loop photosensor in white, a round lens head on a flat mounting bracket

Daylight Sensors vs Photocells: What to Buy, Where It Goes, and Whe...

Two very different devices get sold under the same search term. One is a small photocontrol that turns a parking lot light on at...

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Westgate Manufacturing Buying Guide: How to Spec Westgate LED Fixtures

Westgate Mfg shows up on a lot of commercial bids because its fixtures are field-configurable, which lets one part number cover what used to...

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Lutron PowPak RMJS-8T-DV-B dimming module, a green circuit module in a white housing with a wiring pigtail

Lutron RMJS-8T-DV-B: The Vive PowPak 0-10V Dimming Module, Explained

The RMJS-8T-DV-B is one of the most-specified parts in Lutron's commercial wireless range, and one of the most frequently mislabelled. It is not a...

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