Arc and Incandescent Lamps

7%e wavelength-dependent ou ut of Xe lan s is a major reason for distortion of the excitation spectra of 

Because of the heat and high intensity of arunning xenon lamp, it is not practical to adjust the position of an uncovered lamp. Hence, the lamp housing should have external 

Usually, one requires the ability to choose the excitation wavelengths to suit the fluorophote, rather than vice versa. Hence, these lamps are only useful if the Hg lines are at suitable wavelengths for excitation. 

Previously, such lamps were not useful fm fluores- 

Low-Pressure Hg Lamps. These lamps yidd very sharp mtfcuiy line spectra which are useful immaiily fix calitnttiim purposes ( gure 2.7). IMails of this procedure are desoSied in Section 2.3.E. 

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