Microscope Bulbs HLX G4 2-Pin Base OSRAM HLX Halogen lamps offer brilliant light, high light output, a constant color temperature and excellent color rendering throughout their lives.The OSRAM HLX are easy to use, dimmable and do not contain any mercury. This makes them not only extremely powerful but also extremely eco-friendly. The pins in a G4 base are 4mm apart. Features Compared to standard lamps up to 10 % higher luminous efficacy (HLX) higher with same power consumption Recommended for microscopes Datasheet Specifications: Mfr. No. 64223 OSRAM HLX Halogen lamp for microscope. 10W 6V G4 2-Pin. Color Temperature 2900 K, Lifespan 300 h Mfr. No. 64250 OSRAM HLX Halogen lamp for microscope. 10W 6V G4 2-Pin.Color Temperature 3350 K, Lifespan 100 h Mfr. No. 64265 OSRAM HLX Halogen lamp for microscope. 30W 6V G4 2-Pin.Color Temperature 3200 K, Lifespan 100 h Mfr. No. 64258 OSRAM HLX Halogen lamp for microscope. 20W 12V G4 2-Pin.Color Temperature 3050 K, Lifespan 2000 h