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NEMA SS-1 sets the material and performance baseline for outdoor photocontrols in the North American market, with UV stability, photosensitive window performance, mechanical strength, and environmental sealing as its core requirements.
Long-Join’s product design addresses each requirement directly. Combined with UL, CE, and ENEC certification coverage, Long-Join’s photocontrol range

CE is useful. It just can’t replace UL773.
CE proves basic European safety and EMC compliance. UL773 goes deeper — relay action, insulation, heat, moisture, surge protection, long-term reliability under actual outdoor stress.
North American street lighting? UL773 is non-negotiable. European market? CE matters. Selling globally? Find a

UV stabilizer is not an optional quality upgrade for photocell housings, but a required material specification under UL1598, ENEC, and NEMA SS-1. Without it, photocell housings yellow and lose transmittance, embrittle and crack, lose sealing integrity, and fail mechanical strength requirements within one to three years of outdoor service.

UL773 sets four material performance requirements for photocell bases that PC cannot reliably satisfy in the real-world thermal and humidity conditions of outdoor luminaire installation. GF+PBT with high glass-fibre content meets all four requirements with significant margin.
Long-Join specifies high-glass-fibre reinforced PBT as standard across its photocell base range,