A line of sunlight-visible, bayonet-base 6/7 LED cluster lamps suitable for use in medical instrumentation can serve as replacements for incandescent T3¼ miniature bulbs. The LED lamps feature a 90% reduction in power consumption, with very low power draw of 0.8-0.91 watts, depending on the LED light color, and directly replace numbers including 6MB, 44, 47, 755 (5/6V) 12MB, 756 (12/14V), 24MB (24V), 313, 757, 1819, 1829 (28V), 48MB (48V), 60MB, 1835 (60V), 120MB and NE51H (120VAC). The solid-state design of the BF3126 and BF3127 Series LED lamps makes them impervious to electrical and mechanical shock, vibration, frequent switching, and environmental extremes. They boast faster turn-on and reaction time compared with filament lamps, yet provide comparable luminous intensity and pure wavelength light for a more uniform illumination. These miniature bayonet-base bulbs are available in a range of sunlight-visible LED light colors, and are socket and circuit compatible. They feature a viewing angle of 120 degrees, are rated at 100,000 hours MTBF for color light and up to 50,000 hours for white LED light, and are field-replaceable.