A fluorescent lamp is filled with mercury vapor and a noble gas and the inner surface is coated with a fluorescent coating. This coating will emit visible light when short wave UV light - generated by the gas-discharge exited mercury atoms - hit the coating. The fluorescent lamp produces more light than an incandescent lamp. Also heat production is much lower

7 Watt fluorescent ring light for incident illumination for incident illumination with a "long-life" lamp (>5000 hrs). Suitable for Novez RZ stereo microscopes when no additional lenses are used. When used with additional lenses, adapter 65.8
More info>
Fluorescent high frequency 40 kHz ring light for incident illumination. To be mounted on the stereo heads of EE.1522, EE.1552, EE.1523 and EE.1553 stereomicroscopes. For 230 Volts operation
More info>
Fluorescent high frequency 40 kHz ring light for incident illumination. To be mounted on the stereo heads of EE.1524 and EE.1554 stereomicroscopes. For 230 Volts operation
More info>
Fluorescent lamp for incident illumination for ST.1750 stand for gemological purposeses. For 230 Volts operation
More info>