Betalux signs are lit by means of tubes of borosilicate glass filled with tritium gas.

On the inside the tubes are covered with a fluorescent powder, which emits continuous light because of the ionising radiation of the tritium gas (131,000hrs). The entire sign is comparable to a fluorescent lamp, for which the current going through the lamp is replaced by tritium gas. Therefore, no electrical connection is needed.

This form of escape route direction has already been applied in aeroplanes, where reliability comes first, for over 50 years. In the past few years, however, they have been used in buildings more and more.

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