GPS LightLock

Astronomical Timers
Powered by GPS
US Patent 8,816,842
Zero Programming                 Zero Maintenance 

15 Year Performance Warranty!

Made in USA


GPS LightLock instantly installs everywhere you have existing photocells and programmable timers. 

GPS LightLock is used worldwide by Fortune 500 companies, public utilities, cities, counties, airports, universities, lighting manufacturers, HOA's, and private individuals alike.



Available Nationwide From

Onboard GPS does all your programming & maintenance for you

GPS LightLock automatically sets your date/ time & location, programs dusk-to-dawn switch times for your location, self-recovers from power outages & keeps the clock timed to the GPS atomic clock. There is nothing to confuse you and nothing to go wrong. You'll never have to deal with daylight savings time again!

For all lighting technologies and all lighting applications

For all HID, LED, HPS, Incandescent, Fluorescent, Halogen, & all other lighting technologies. For all roadway lighting, parking lots, landscape lighting, sign lighting, wall sconces, yard lights, and all other outdoor lighting applications.

Complies with all Energy Codes

GPS LightLock is an astronomical time switch designated for dusk-to-dawn operations. GPS LightLock is a time switch capable of retaining programming and the time setting during loss of power indefinitely. GPS LightLock never requires any programming or batteries. For step dimming or local time control, if required, simply connect the GPS LightLock control leg (red wire) to the line side control circuit of the occupancy sensor or local time clock.

GPS LightLock is available in many different configurations.

Twist-Lock configuration for easy installation in about five seconds anywhere you have existing photocells. Wire-In configuration for easy replacement of programmable timers & wired-in photocells. Controlled receptacles for landscape lighting, holiday decorations or anything else you want on from dusk until dawn. Also available with bypass switches, GFCI protection, multi-gang switching and more.

More than just an outdoor light controller.

Our customers have come up with all sorts of creative applications for GPS LightLock including control systems on boats, access control to parks, pools, and other facilities open dawn-to-dusk, solar controls to prevent select loads from running off-peak, irrigation systems controls, off-grid power generation control logic and much more.

Outperforms Astronomical Timers Costing $100's More


GPS LightLock

15 Year


Astronomical Timer


365 Day

Astronomical Timer



7 Day

Astronomical Timer



from $59.99




15 Years

2 Years

1 Year

Service Interval

15 Years

Batteries 2-3 Years

Batteries 2-3 Years





Onboard GPS




Installation Time

1 - 15 min

1 Hour +

1 Hour +

Replacement Time

less than 1 minute

1 Hour +

1 Hour +

Comparison among Astronomical Timers in a NEMA 3R outdoor enclosure. 

Prices eff. Feb. 2016.

1. Intermatic is a registered trademark of Intermatic Incorporated.


We received and installed your GPS LightLock products and they have been working perfectly. The synchronization between the astronomical timers has been reported as less than a second apart. Our City Electricians are happy about the plug and play, time saving functionality of the device. Thanks for making your product available in Canada. 
Wayne B., Assistant City Electrical Foreman

We have 7 shopping centers in 2 states. We upgraded the outdoor lights to LED’s three years ago and our contractor installed GPS LightLock. Our property managers haven’t had to call an electrician since. We're saving money and we love it. Thanks GPS LightLock! 
Paul & Mary R., Norcross, GA


This place had 50 photocells when I started here 10 years ago. Everyone complained the lights switch all crazy. We tried $600 timers and they were so bad we put the photocells back in. Then we found GPS LightLock. They're perfect.

MC, Electrical Sup’t., Bonita Springs, FL


They are working out perfectly and as advertised. I have tall trees which shade areas of my property where the ordinary photocells did not turn off until 11am and turned on at 4pm. This was wasting energy, money and looked suspect that nobody was home. So your gps timers helped with my security of my property. 
Thank you! Ray B., Chicago, IL 


Worked out great. Works like a charm. Been passing along the info about it to alot of different people. 
Will order more soon. 
Scott S., Electrical Contractor, Farmington, IN


When we had to change out a programmable timer, we had to go to the supply house, spend $400, come back and rip the guts out of the old one, rip the guts out of the new one, put the new guts in the old housing, make up the connections and it took half the day. With this thing, it’s BAM! DONE! Under a minute!

Paul S, Lead Electrician, State University Campus, Estero, FL


I now have all of my present exterior lights controlled by GPS LightLock.  I’m waiting for the Township to do the installation that will put the illumination of our township clock under control of your product. Great product.


Richard, NJ



David W.

Waller, TX


It worked as advertised right out of the box.

William H, Saint Francisville, LA


Great product. Will buy more. Would recommend.

David C., 9/11/2015


Love the timers. I am installing them in lights at our church. Far superior to other timers. Will buy more as I can install them. Thanks.

David W. (2nd order), WALLER, TX 


Great product!

David C 10/4/2015 (2nd order)


I just returned from a Township Committee meeting and am happy to report that the 19th century clock is now illuminated by a 21st century light control system. 

Regards, Richard, NJ


Great cure for the shady side of the building

Cale R., Centerville, OH


The unit works great for our garage lighting. We recently got a second one for our landscape lighting. It's great. Thanks for a great product.

Mike M, Taylor, MI


Installed last week. Works exactly as advertised.

William S, Townsend, DE


Improve your outdoor lighting performance today

with GPS LightLock




Available Nationwide From

Electricians, Electrical Contractors & 
Electrical Engineers: 

Do you need CEU's?
Are you going to be taking a professional license exam?

GPS LightLock recommends Mike Holt Enterprises for all your CEU's & Exam Prep needs. Located in Orlando, FL, available online and certified in more than 30 states and growing, Mike Holt Enterprises is the industry leader in Electrical CEU's & Exam Preparation. Please click below for more information.
GPS LightLock is a division of
Applied Physics Laboratories 
PO Box 2544  Fort Myers, FL 33902 
(239) 848-6675