Poor quality equipment.
No need to save on tanning beds. Each cheapness has a reason – maybe the lamps have not been changed for a long time or the salon has bought them already used. Remember that the life of the lamp is only 540 hours, and it is almost impossible to control the effect of the operation of expired devices.
Therefore, when deciding to visit a solarium, be sure to check that the lamps in it are replaced in a timely manner. By the way, new lamps also require the right approach – you need to sunbathe under them less than what your skin type should.