Longlife Photocells

The most accurate hardwired photocell on the market


The 8481-H Westire photocell utilises Westire’s Eye Response filtered silicon light sensor and microprocessor control. This accurate combination provides the best energy savings and reliable operation.


Engineered, in the EU with a 35 year design life and manufactured in-house using only high quality name brand components, the 8400 series photocells are renowned in the industry for their unparalleled quality and reliability.

Features & Benefits

  • Conduit mounting thus no need for ANSI/NEMA socket or receptacle.
  • Can be used in place of 20 mm lighting controls.
  • Designed for modern light sources like LED, Induction, Plasma, HPS, HID and many more.
  • Available in universal power supply capable of operating on voltages from 105 to 305 Volts 50/60 Hz.
  • Westire Patented Relay Assisted Triac (RAT) switching technology protects the relay from in-rush current.
  • Polycarbonate housing is ultrasonically welded, UV stabilised and rated to IP67.
  • Upward facing units are designed to be self cleaning.
  • 100% product testing, 48 hour burn-in, electrical and final inspection.
  • Energy efficient design with an average power consumption < 0.25 watts.
  • Intertek ETL Listed and RoHS compliant.
  • Available with up to 840 Joule MOV protection.

The upward facing sensor has a 67% view of the sky resulting in higher switching accuracy!

Cap Colours

Various housing colours are available, black, blue, brown, green, red and grey

Connection Type

The 8481-H Long Life Photocell has a hard-wired 3 cable flying lead connection with an M20 threaded mounting secured by locknuts and gaskets.


Dimensions3.1” Ø x 2.75” H
Warranty12 years standard
20 years available on request
Mains Supply105 - 305 Volts AC
50/60 Hertz
Average Power Consumption<0.25 Watt nominal
Surge ProtectionStandard: 132J 4.5kA
Optional: 320J 12KA, 420J 20KA
Configurations available up to 840 Joules
Operating Temperature-40° C to + 80° C
-40° F to +178° F
Standards ComplianceEnvironmental RoHS, EN55015, EN61547, EN6100-3-2, EN6100-3-3, ETL
UK 773, CSA 22.2.
IS EN ISO 9002: 2015
ANSI C136.10
Enclosure Protection RatingIP67 - Dust tight and immersion tested up to 1m when fitted in the luminaire.
Operating Levels10 - 200 Lux
1 to 19 fc ± 0.025
Switching Ratio1:0.5 to 1:3 Inverse ratios available
Light sensorEye Response IR filtered silicon light sensor
Switching Time Delay0 to 25 Seconds ON
2.5 to 20 Seconds OFF
Connection TypeHard-wired 3 cable flying lead connection with M20 threaded mounting secured by locknuts and gaskets.