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  • Intermatic K4121C 120-Volt Stem Mount Photo Control
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Intermatic K4121C 120-Volt Stem Mount Photo Control

30 customer reviews
| 3 answered questions

List Price: $13.72
Price: $9.64 & FREE Shipping on orders over $35. Details
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  • Single and multi-volt models with stem mount
  • Light level slide adjustment
  • 1/2-Inch-14 threaded stem
  • Washer gasket packaged with each photo control
  • Locking nut packaged with each photo control
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Frequently Bought Together

Intermatic K4121C 120-Volt Stem Mount Photo Control + Intermatic K4221C 120-Volt Stem and Swivel Mount Photo Control + Westek SW103CT Outdoor Swivel Photo Control
Price for all three: $26.66

Buy the selected items together

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Product Description

Product Description

  • Brand: Intermatic
  • -
  • Part No.: K4121C
  • -
  • Voltage: 120
  • -
  • Mounting: Stem
  • -
  • Watts Ballast: 1000
  • -
  • Watts Tungsten: 1800
  • -

From the Manufacturer

This series features single and multi-volt models with stem mount. All models are equipped with a light level slide adjustment and provide a 1/2-Inch-14 threaded stem. A washer gasket and locking nut are packaged with each photo control.

Product Information

Technical Details
Part Number K4121C
Item Weight3.2 ounces
Product Dimensions6 x 6 x 6 inches
OriginMexico
Item model numberK4121C
National Stock Number6110-00-294-0873
ColorWhite
StyleStem Mount
FinishGray
MaterialPLASTIC
Power Sourcewired electric
Voltage120 volts
Item Package Quantity1
Number Of Pieces1
Warranty Description5 Year
  
Additional Information
ASINB000P0FPVO
Best Sellers Rank #15,655 in Home Improvement (See top 100)
Shipping Weight1.6 pounds (View shipping rates and policies)
Domestic Shipping Item can be shipped within U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First AvailableApril 6, 2006
  
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Important Information

Bulb Voltage
120 Volts

Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

8 of 9 people found the following review helpful By Pavman on August 22, 2013
I have owned several of these photocells from Intermatic so I do have experience with them. In the old days I needed to use the light blocking shield on them to reduce the amount of ambient light so they would come on a dusk. Not sure what Intermatic has done but these new ones I purchased stay about 75% of the day, they have no sensitivity. Yes, I have tried pointing them in different directions etc.. and I have more than one installed. They will work fine if pointed at the sun but if you are mounting on an outside wall that has any kind of shade they are worthless. Perhaps they are making these overseas and the quality of the cell is just junk.

More disappointing news, I called customer service at Intermatic and they had nothing of relevance to say, nor could they suggest any of their other models that had some sensitivity. Perhaps I got a bad batch, but i am not going to waste my time or money with these again.
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Verified Purchase
I purchased this to replace a failed K4221C (same sensor with an articulating arm) that was already failed when I purchased my house. As it turns out, I was able to remove the arm from the failed K4221C and attach it to this model (the K4121C). Works fine for now. I'll see how long this one lasts.

It is hard to tell from the photo, but it comes with two rubber washers. This came in handy when retrofitting to the articulating arm.
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2 of 3 people found the following review helpful By T. Uli on June 5, 2012
Verified Purchase
Bought this sensor to control a night time security light with a CFL bulb. It works good, no flickering or problems normally encountered with CFL's and sensors. The sensor is not very sensitive to light. It comes on early and shuts off late. Should be mounted where the daylight can get to it easily.
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By Rebecca McGrath on December 6, 2014
Verified Purchase
I installed this in Minnesota in December 2014. It turned the light on the first night, and turned it off in the morning. It turned it on the second night, and won't turn off. The troubleshooting guide lists a few suggestions that could cause this, like low line voltage. The line is fine. The product is junk. I was about to buy a second one. This is being returned.
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Verified Purchase
Every 3-4 years I have to replace it. It's easy to replace and it is inexpensive. I buy them 2 at a time now because I know it will fail after a few years. I have searched for a replacement but can't find anything better. Those I have found seem to have the same problem,. Maybe its just the nature of the beast.
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Verified Purchase
If you are installing this outdoors please remember that you cannot install this item upside down! But you shouldn't do that with any similar item like this regardless of brand name. Speaking of brand name it is worthy to note that Intermatic is a quality name with consistent results.
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Verified Purchase
After replacing several big box store sensors which did not meet my expectations decided to try this one purchased through Amazon.
Packaged well, wire diagram easy and straightforward and has worked well since installed. Will update review if it fails prematurely.
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3 of 5 people found the following review helpful By R. M. Hutchins on April 28, 2012
To respond to someone else's complaint that their light turns and and off (regardless of how they positioned the aperture cover) --- what, typically, causes the light to "blink" on and off (regardless of how you position aperture cover, or regardless of which product you are using) is that the light which is turned ON by the device shines enough light on the photocell to tell the device that there is light; so the device, then, thinks there is an alternate source of light and turns the light OFF! Then, when the device turns the light OFF, it is dark; so the device thinks it is dark, and turns the light ON. This repeats indefinitely! You need to position the light so that when the light turns on, the light does NOT trip the photocell; the photocell must rely on a light source (or lack thereof) other than the light which is being turned on by the photocell device (point the photocell AWAY from the light which is being turned on by the photocell).
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Intermatic K4121C 120-Volt Stem Mount Photo Control
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