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FIRE HAZARD WARNING! LM465 Lamp Module

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bikerjoe:
Please read this entire post.

I have purchased many X10 products over the past several years and have enjoyed the ease of installation and use.  However, I now feel compelled to bring your attention to a very serious matter.

As you may know, people are switching to the CFL (Compact Florescent Lamp) bulbs.  In fact, the government has mandated that incandescent bulbs not be sold after 2012.  These CFL bulbs screw into ordinary table lamps and ceiling fixtures, so you may not be aware of the FIRE HAZARD that exists when mixing a CFL bulb with the LM465 Lamp Module.

A few months ago, I came home to discover that one of my LM465 modules had burst into flames without warning and scorched the solid wood pine tongue and groove paneling wall that bore the outlet powering a table lamp.  I reasoned that the X10 unit was "old" and this was probably the cause.  Fortunately, the fire only melted the module and scorched the wood, but missed the upholstered chair that was only a foot away from the unit.  The molten plastic dripped down to the baseboard and scorched the carpet, but happily, the carpet did not catch fire. Had the flames found the back of this chair or ignited the carpet, I am certain my home would have burned to the ground.  I replaced the module with a NEW LM465 purchased from Fry's. 

Today, Feb. 5, 2008, I came home to discover that ANOTHER LM465 lamp module (not the replaced unit) had burst into flames.  Again, luckily, the fire damage was minimal and the flames missed the wooden end table that was just above the unit.  I immediately pulled ALL of my LM465 lamp modules.  It was then that I noticed the small tag on the back of the unit which reads "For indoor INCANDESCENT lamp use only.  Both of the lamps associated with the fires had the 13 WATT CFL bulbs in the sockets!  Another module in another room showed signs of melting as well, with the metal melting through the back of the unit near the power tabs and a black burnt carbon spot on the top rear left corner surface.  This lamp ALSO had a 13 watt CFL bulb in it.

This is important, as the CFL bulbs we are now using to replace the old standard incandescent bulbs are still FLORESCENT bulbs, and the LM465 units HEAT UP while powering these bulbs for any length of time, and can burst into flames WITHOUT WARNING.

I want to stress that the X10 LM465 units are NOT defective, but it is imperative that you understand that when you plug a lamp or fixture into these modules when a florescent bulb is providing the light, you run the risk of the LM465 unit overheating and causing a spontaneous fire in your home or business.  You MUST use an incandescent bulb in lamps that are plugged into the LM465 module, as the attached warning label states!

I hope that the fine folks at X-10 look into this incompatibility issue and begin to manufacture lamp modules that can handle the new, soon-to-be federally REQUIRED CFL bulb's power requirements.  Since my entire home is now converted to cFL bulbs, I will not be using my old X10 lamp modules until a safe solution is found.


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Brian H:
Thank you for your very valuable findings.
I would also say this could happen with mixed systems with other brand lamp and dimming wall switches.
CFLs if UL rated require they be made of a fire resistant plastic. LM465s and such probably are not required to use fire retardant plastic. Also the B&D Lamp Module and Insteons also have a fuse in them that May or May not have helped.
I believe the users manual also states "Incadescent type bulbs ONLY!"
Yes all manufacturers are gong to have to address this issue shortly. I have LED type that never go off just 1/2 brightness from the Local Sensing Circuits current.

JeffVolp:
While you may very well have had a serious failure with X10 lamp modules, I would like to get more information to understand the mechanism involved.  CFLs rectify the powerline voltage to feed the internal electronics.  Newer units with small bases may include a switching pre-regulator to allow them to use a smaller filter capacitor and lower voltage components for the chopper.

As long as the lamp module is just turned on or off, I don't understand what could cause the failure.  However, if the lamp module is dimmed there can be switching transients near the peak of the AC waveform.  That could produce voltage transients in excess of what the CFL circuitry can withstand, particularly in the type with the switching pre-regulator.

We have used lamp modules with CFLs switched ON/OFF for over a decade.  Some were the Phillips Earthlights that were designed for dimming.  We have had no lamp module failures, and the Earthlights lasted a very long time.  Now we have a mix of brands, and all have been working fine on the lamp modules.

It would be interesting to find out what brand and model of CFL you had a problem with so others using X10 lamp modules can steer clear of it.  I would also like to purchase one to find out what might be the mechanism that causes the failure.  I understand that some of the newer lamp modules may ramp on and off, and that might be a factor too.

Jeff

Oldtimer:

--- Quote from: bikerjoe on February 06, 2008, 05:38:05 AM ---
This is important, as the CFL bulbs we are now using to replace the old standard incandescent bulbs are still FLORESCENT bulbs, and the LM465 units HEAT UP while powering these bulbs for any length of time, and can burst into flames WITHOUT WARNING.


--- End quote ---

As soon as I read this I immediately checked the lamp modules I'm using to control CFLs to see if they were getting too hot.  Mine were only mildly warm to the touch BUT were being used with resistors to bleed off the local control current  so the CFLs wouldn't blink when the module was turned OFF!  Click here to see how to do this. My experience has been that CFLs interact with X10 modules to produce a very choppy AC waveform in the wiring between the module and the bulb.  It may be that the resistor has the additional benefit of shunting the worst of this signal away from the module.

It sounds like bikerjoe has found some CFLs that work, as is, with his lamp modules.  Perhaps he could give us some more details about the brand he's usiing.  Also my lamp modules are older production, some white some brown but none of the very latest production.  Again it would be good if bikerjoe could document what vintage he has since X10 has a history of keeping the same model numbers across major design changes.

This is an important issue and I'll be watching it closely.  I'll also post appropriate links in my tutorial as I get more data. I've also given bikerjoe a helpful for this post.

P.S.  I had just finished writing this when Jeff posted his reply, above, asking for the same info.

steven r:
As JeffVolp said, I don't see why a LM465 module just turned on and off would cause a problem. It does point out the danger of using a module capable of dimming for a non dimming CLF. X10 has changed their wall switches to remember their dim setting. If they did that with the LM465 module, once dimmed just turning module off and on wouldn't restore full brightness. If you still have the LM465 modules, please post their date codes.

I'd love to have the benefit of Jeff's experience on the situation and hope you will provide him the information for him to test the CFL bulbs you are using.

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