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Fluorescent lighting is used for the administrative and industrial building
illumination (Figure 9.7). However, they cannot be used in conditions of low
temperature. Gas-discharge lamps of high pressure are used if there is a need the

high light efficiency, light source compactness and stability despite adverse
environmental conditions.

Figure 9.7 – Fluorescent light bulb diagram

In order to avoid the dazzle effect, the bulb is placed into the fitting that
prevents excessive brightness of the source and protects it from the effect of fire- and
explosion-hazardous and reactive environment, mechanical failures, dust, dirt and
atmospheric precipitates.
Depending on construction, there are the following types of lamps: open (the
bulb is not separated from the environment), protected (the bulb is separated with a
shell that is no barrier for free air penetration), closed (the shell protects the lamp
from large dust particles), dust-tight lamps, waterproof lamps, explosion-hazardous
lamps, lamps of improved reliability against explosion.

Figure 9.8 – Comparison of different types of lamps

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