Bathrooms place higher requirements with respect to safety than other living spaces. Luminaires that are installed in particular areas of the bathroom need to be approved for damp areas, i.e. they must be well protected against water and dampness. The respective protection class provides information on this topic. The two letters IP are followed by two digits. These specify the degree of protection of the luminaire with respect to foreign bodies (first digit) and humidity (second digit).

1st reference number	2nd reference number
0 – not protected	not protected
1 – protected against solid particles > 50 mm	protected against dripping water
2 - protected against solid particles > 12 mm	protected against dripping water up to 15°
3 - protected against solid particles > 2,5 mm	protected against spraying water
4 - protected against solid particles > 1 mm	protected against splashing water
5 – protected against dust	protected against jets of water
6 – dust-proof	protected against powerful jets of water
7 - /	protected against temporary immersion
8 - /	Protected against long periods of immersion