| 摘要 |
A downlight assembly comprising:—(i) a mounting ring having a tubular body with an opening at a rear, the mounting ring being formed from a material that withstands temperatures used for fire rating tests and having a lower peripheral annular flange extending outwardly from a bottom end of the tubular body, and an upper peripheral annular flange extending inwardly from an upper end of the tubular body, said upper peripheral annular flange enabling the rear of the mounting ring to be substantially closed if required; (ii) a solid state lighting element comprising one or more LEDs mounted on a circuit board formed from a material having a melting point lower than 1000 degrees C.; (iii) a heat sink formed from a material having a melting point lower than 1000 degrees C. and being in thermal contact with the solid state lighting element and located substantially outside the mounting ring; and (iv) intumescent material wherein the intumescent material is adapted to expand to fill or occlude the tubular body in the event of a fire. |
