SKU: 28683001541

PHOTOCELL 120V - K4221

Sale price$19.58 Regular price$21.76
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Ships within 48 hours · Estimated delivery Aug 18 - Aug 23

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Description

PHOTOCELL 120V - K4221The K4221 120V Photocell Thermal Control delivers reliable automatic lighting control for pool contractors managing commercial and residential outdoor lighting systems. This stem and swivel mount photocontrol provides professional grade dusk to dawn operation with advanced delay features that prevent false switching from transient light sources. Commercial Pool Lighting Benefits Designed for demanding outdoor environments, this thermal photocontrol

The K4221 120V Photocell Thermal Control delivers reliable automatic lighting control for pool contractors managing commercial and residential outdoor lighting systems. This stem and swivel mount photocontrol provides professional-grade dusk-to-dawn operation with advanced delay features that prevent false switching from transient light sources.

Commercial Pool Lighting Benefits

Designed for demanding outdoor environments, this thermal photocontrol reduces maintenance calls with its weather-resistant polycarbonate housing and sonic-welded moisture seal. The mechanical bimetal switch with cadmium sulfide photocell ensures consistent performance across temperature ranges from -40°F to 158°F, making it ideal for year-round pool installations.

Why Pool Contractors Choose MT Pools

MT Pools provides superior customer service and wholesale pricing that supports your profit margins on lighting automation projects. Our daily recurring customer support ensures you have the technical expertise and reliable inventory to keep your pool lighting installations on schedule and profitable.

Frequently Asked Questions

What lighting types are compatible with the K4221 photocell?

The K4221 is compatible with fluorescent, HID, and incandescent lighting systems, handling up to 15A incandescent loads and 8.3A/1000VA magnetic ballast loads.

How does the delay feature prevent false switching?

The 30-90 second sensor delay prevents unwanted switching from car headlights, lightning, or other transient light sources, ensuring reliable dusk-to-dawn operation.

Is installation flexible for different fixture types?

Yes, the swivel arm design allows flexible installation to standard outdoor fixtures or electrical boxes with 1/2"-14 NPSM threaded stem and included mounting hardware.

What certifications does this photocontrol have?

The K4221 is UL and cCSAus certified with Green Energy and Title 20 compliance, meeting professional installation requirements for commercial pool projects.

Order Today

Trust MT Pools for your pool lighting automation needs. Our expert team provides technical support and fast shipping to keep your projects profitable and on schedule.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 28683001541

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4.6 ★★★★★
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Jenny J
Lake Worth, US
★★★★★ 5
Great choice
Style: SPF 50 Roll On, Size: 3 Fl Oz (Pack of 1)
After I suffered a second-degree burn from steam, I was told by my doctor that I would have to keep my new fresh skin sun-blocked for up to a year to avoid any scarring or hyper pigmentation. This has been a great selection as it is a roll-on, Which helps a lot with preventing messes that can happen with traditional sunblock bottles. I also like that it is easy to travel with, and the fact that it is zinc based.
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Reviewed in the United States on August 26, 2025
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A reader
Massapequa, US
★★★★★ 5
My favorite new mineral sunscreen!
Style: SPF 50 Roll On, Size: 3 Fl Oz (Pack of 1)
This is my favorite new mineral sunscreen! I've been searching for years for a product that is easy to apply, not messy, and doesn't show up too white. This roll-on is the perfect solution. I keep it near the front door and quickly roll the sunscreen on my hands, arms, and chest before leaving the house. The sunscreen applies so quickly and uniformly-- there are no bare spots or messy globs to rub in. Also, the roll-on keeps the sunscreen from oozing out of the tube and getting all over everything. Finally, the roll-on method also eliminates the frustration of having half-filled tubes and pumps where you can't even access the sunscreen when the tube gets low. Here's hoping this doesn't happen with the roll-on. Thank you Sun Bum for creating this wonderful product. I also love the reasonable price.
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Reviewed in the United States on October 24, 2025
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Cathy mccann
Carnegie, US
★★★★★ 5
great product - it must be blended in well
Style: SPF 50 Roll On, Size: 3 Fl Oz (Pack of 1)
Love this stuff. The roll-on makes it easy to apply on the go. It leaves a white streak unless you blend it in. I don't mind the white streak - at least I know I applied the product.
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Reviewed in the United States on February 4, 2026
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Justin S
Boise, US
★★★★★ 4
Good product, a little pricey though
Style: SPF 50 Roll On, Size: 3 Fl Oz (Pack of 1)
Pretty good consistency and easy to be applied evenly. Much better than the sunscreen products I used before
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Reviewed in the United States on May 29, 2025
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Ryne n.
Carnegie, US
★★★★★ 5
Perfect sunscreen
Style: SPF 50 Roll On, Size: 3 Fl Oz (Pack of 1)
I love the roll on sunscreen. It is quicker to apply and my little one can help without squeezing sunscreen everywhere. Will buy again.
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Reviewed in the United States on June 14, 2025

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