; provided for in subheadings 8524.11.90 or 8524.91.90 effective January 27, 2022) . (49) For heading 9902.17.27, Optical attenuators designed to reduce the power level of an optical signal, either in free space or in an optical fiber, such instruments or apparatus specifically designed for telecommunications (provided for in subheading 9013.80.90 prior to January 27, 2022; provided for in subheading 9013.80.91 effective January 27, 2022) . (50) For heading 9902.17.47, Electric light emitting diode (LED) lighting fittings, of base metal other than of brass, whether ceiling (hanging) or wall mounted, each with LED light source concealed above a quartz cylinder and designed to create a total internal reflection (provided for in subheading 9405.10.60 prior to January 27, 2022; provided for in subheading 9405.11.60 effective January 27, 2022) . (51) For heading 9902.17.48, Electric table or desk light-emitting diode (LED) task lamps, of base metal other than of brass, each with interchangeable mounting options including bases, clamps or other mounts (provided for in subheading 9405.20.60 prior to January 27, 2022; provided for in subheading 9405.21.60 effective January 27, 2022) . (52) For heading 9902.17.49, Electric table or desk light-emitting diode (LED) task lamps, of base metal other than of brass, each with ball joints to allow multiple positions of the lamp head relative to the base (provided for in subheading 9405.20.60 prior to January 27, 2022; provided for in subheading 9405.21.60 effective January 27, 2022) . (53) For heading 9902.17.52, Emergency lights, of base metal other than of brass, round or elongated in shape, measuring between 6 and 12 cm in height, each containing incandescent lamp, lamp holder, reflector, clear glass lens with drain hole, pressure can and electrical pigtail with connector