My Duo Light has started to pulsate

[leakyroof]

It’s very slight, but a rhythmic , slow pulsation of the light out from the Duo Light.
  I will need to try the light on a different outlet tomorrow to see if it was an outlet issue.
But after about an hour or so of operation later this afternoon, I suddenly noticed the brief dimming of the light, and it was at a timed interval.
Weird, never had it do that. And I’m only a part timer user of it at that.
I love it for painting and sanding a room, since it fills the room with great work space lighting, but that pulsating is annoying..... [huh] [huh] [huh]
It’s not hot in the room I’m working in, it’s Fall in Chicago, the vents on the light are open and clear of debris too.

Anyone else run into this?

 

[mkasdin]

Yes. I bought the light when it first came out. It’s been doing it for over a year. I called Festool up and they said it was not broken? Just part of the circuitry to keep it from burning out. Mine will dim out and then go back on. It happens more and with greater frequency when the weather is warm. I typically just turn it off, given the opportunity and let it cool down. Then start it back up after lunch, during a mid-day break or siesta.

 

[leakyroof]

Thanks for the reply, so I’m not alone with this..... [smile]
  It is of course more noticeable with outside light getting dark late in the day, so that’s probably how I noticed it, with painting in a room with no other light source.

 

[mkasdin]

Mine will actually turn off momentarily or will flicker. Sometimes incrementally. I called Festool support they said “the light is doing what is suppose to be doing, so it doesn’t overheat using the circuitry.” so it doesn’t self inflict itself; basically a safety feature... I’m planning on selling the light once they start packaging it with the new systainer3. I actually don’t remember the light doing this in the first 2 years of operation. My Duo is out of warranty so as long as it keeps chugging I’m fine with it.
I’m wondering if there is dust on the heat sink inside which is causing some issues?
I have a video of the light malfunctioning, I’ll try to post it if people are interested. It’s a bit of a safety hazard, but I’m cognizant of the issue so it’s calculated. I’ve had the light turn off while using the table saw so it is a safety concern when your all of a sudden ripping lumber in the dark with a Bosch 4100 table saw?

 

[xedos]

called Festool support they said “the light is doing what is suppose to be doing, so it doesn’t overheat using the circuitry.” so it doesn’t self inflict itself; basically a safety feature...

What a load of b%$*^st !  If it's overheating under normal worksite conditions before the battery runs down, then the engineering and design is rubbish.    My bosch and milwaukee lites don't flicker or go into self protect mode.  Nor does my el cheapo wal mart LED.  Perhaps the engineer that worked on the first gen Carvex designed this circuit too.  It had light problems as I recall too.

I’m planning on selling the light once they start packaging it with the new systainer3.

    [scared]

note to self - don't buy a used tool from you.

 

[leakyroof]

called Festool support they said “the light is doing what is suppose to be doing, so it doesn’t overheat using the circuitry.” so it doesn’t self inflict itself; basically a safety feature...

What a load of b%$*^st !  If it's overheating under normal worksite conditions before the battery runs down, then the engineering and design is rubbish.    My bosch and milwaukee lites don't flicker or go into self protect mode.  Nor does my el cheapo wal mart LED.  Perhaps the engineer that worked on the first gen Carvex designed this circuit too.  It had light problems as I recall too.

I’m planning on selling the light once they start packaging it with the new systainer3.

    [scared]

note to self - don't buy a used tool from you.

. The Duo Light isn’t battery equipped . Strictly household or job site voltage.
Today I worked 2 hours straight with mine, didn’t act up at all.

 

[mkasdin]

My duo will run for hours and hours before it shows signs. It’s obviously a thermo overload issue, because in the cooler temperatures it’s not really an issue. During the summer inside the house with 95 degree temperatures, no air conditioning, it occurred more often.