A new addition to Lucy Zodion's extensive range of street lighting control products, the unique SS21 DALI photocell is factory programmable with up to eight stages of on, off and dim to offer energy savings along with a high level of control and flexibility. A long product lifespan is assured due to the use of high grade components, through hole plated PCB and a high impact UV stable polycarbonate casing. The SS21 DALI photocell has also been designed specifically to integrate seamlessly with modern lantern housings


  • Unobtrusive miniature format
  • Dimmable from 100% to 10% of light output in 10% steps (dependent on driver options)
  • DLS option available for accurate switching in both GMT and BST
  • Low luminance level switching: 20 lux on, 20 lux off - to reflect zero warm time of LEDs (standard lux options also available)
  • Filtered photodiode for CIE photopic performance
  • Microprocessor controlled
  • Through hole plated PCB for increased mechanical durability
  • Intrinsically surge resistant circuit (>2kV)
  • Low energy consumption -
  • Long life design
  • Operational voltage range - 198V - 264V
  • Operational frequency range - 50Hz
  • Power consumption -
  • Operational temperature range - -20°C to 80°C
  • Surge protection - 2kV
  • Switching mechanism - electromagnetic relay
  • DALI communication - broadcast mode
  • Switching level - available in 20, 35, 55 or 70 lux versions
  • Switching differential - available in 1:1 or 1:1.5 ratios
  • Switching delay - 10 seconds (approximately)
  • Sensor drift - photo IC
  • IP classification - maintains lantern IP rating to IP66 (IP67 option available)
  • Operational commands - on, off, dim
  • Multistage operation - 8 transitions (including on, off, dim)
  • Dimming options - 10% to 100% of full light output (in 10% steps) - 25% and 75%  available
  • Fault reporting - internal LED flashes fault code
  • Compliance standards - EN61000-3-2 2009, EN61000-3-3, EN61000-4-2, EN61000-4-3, EN61000-4-4, EN61000-4-5, EN61000-4-6, EN61000-4-8. EN61000-4-11, EN55015 2013, EN61547 2009, EN61347-1, EN61347-2-11, EN61347-2-13, EN60950-1, DALI compatibility


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Dimensions and SpecificationDimensions and Specification

SS21 DALI Photocell
Height 44mm
Width 31.5mm
Length 53.5mm
Weight 58g