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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.
With UV-stabilised GF+PBT, Long-Join’s photocell housings maintain their mechanical and optical properties across the ten to fifteen-year service lives that professional outdoor lighting applications demand.

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, satisfying UL773 requirements and providing the material performance that outdoor photocell applications demand.

PC bases fail in photocell applications because outdoor photocell installation conditions are sustained at high temperatures at the luminaire top, continuous UV radiation, thermal cycling, and moisture exposure, all of which push PC beyond its practical dimensional and UV stability limits.
The consequences are sealing degradation, moisture ingress, PCB corrosion, and switching threshold drift. Long-Join’s GF+PBT bases with enhanced UV stabiliser address all three of PC’s fundamental limitations, providing the dimensional consistency and sealing integrity that outdoor photocell service life demands.