Question about Legrand On-Q/ ALC 600W Dimmer Switch, Smooth Paddle, Almond

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If the legrand dimmer 400w - pro21 can function with led dimmable light "philips master led spot "

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I have exactly the same setup with 15 Philips LEDs and said Legrand dimmer. In order to work, I had to hide inside the ceiling a 60W standard bulb so that the dimmer has more load and now works properly. Without the 60W bulb, the leds flicker while being dimmed, sometimes they flicker at 100%

Posted on Nov 09, 2011


The answer is NO. You need a Trailing Edge dimmer to control LEDs.

The Phillips master LED spot manual says
Lighting controls: bulbs are dimmable 20-100% with ""select"" Trailing Edge RC devices

The Legrand pro21 manual does not say anything about being a Trailing edge dimmer.

Legrand diagrams show what appears to be incandescent bulbs, and say nothing about LEDs

LEDs cannot be dimmed as ordinary incandescent (tungsten) bulb.

More reading:
Wikipedia article on dimmers includes technical stuff on Trailing edge dimmers

2 sites show LEDs bulbs that dim:: both seem new ...

Posted on Oct 11, 2010

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We also had problems with dimming LED light bulbs until we found these bulbs at LED Lighting Wholesale. Check them out!

Posted on Jun 02, 2012

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My led lights start to strobe when I turn on exterior light that is fed from the same line circuit. Solution?

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First; LED and CFL type lamps that are to be used on a dimmer switch - must be identified for that use. Looks for the word dimmable on the packaging or bulb itself. These lamps are generally a little more expensive than their non-dimmable counterparts. If it does not indicate it is dimmable, then it isn't - and should not be installed on a circuit controlled by a dimmer switch.

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It's not quite that simple..

According to the manual for your switch, it is stated "Use with magnetic low-voltage transformers, incandescent, or 120V halogen fixtures only." Also, there is a minimum load of 40W or 40VA. Your LED lamp load will need to satisfy BOTH of these requirements. Electronic circuits are not to be "dimmed" with this dimmer - but use of either the VZE04-1L (400W max) or VZE06-1L (600W max) is supported.

You will need to provide the manufacturer and model number of the LED lamp(s) to be dimmed by this switch. Or, you can use traditional dimmers (if desired) with LED lamps that are specifically labeled as "dimmable" on their packaging.

Once the lamp model is known it will be possible to learn about their dimability assuming that they are not cheap imports with no real customer support contacts. Name brand lamps will have this support, and you can even call them yourself and inquire directly about the suitability to task for the dimmer. If the lam company doesn't know about the switch, contact Leviton with the lamp info at Customer Service: 1-800-323-8920 • FAX: 1-800-832-9538 Tech Line: 1-800-824-3005

Good luck!

May 10, 2012 | Speed Leviton Vizia VZM06-1LZ, 600W, 120...

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Using this dimmer on an outlet that has dimmable LED rope lighting plugged intro it I have a problem. Even when the dimmer is turned off, a small amount of electricity is still being passed to the...

Yes this is not unusual. Any triac conrol device must have a load large enough to turn it off. I have some switches operating compact flourescnts that do the same thing. My cure was to add one incandescent lamp on same switch, and my load devices work fine too.

Aug 10, 2010 | Pass & Seymour / Legrand DFB600-M 600VA...

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