You will need a humidifier, when you're using illuminants with reflectors in closed rooms for cultivating plants under artificial light. Illuminants cause high temperatures in the rooms, wich makes the humidity go down. To counter that, you should use a humidifier. A humidifier works by vaporizing water, evaporation or fogging with ultrasound.

Ultrasonic Cool Mist Humidifier spare diaphragm Art.Nr: 106526 EAN: 4024102287615 Spare diaphragm for the Ultrasonic Cool Mist Humidifier. 9,50 EUR incl. 19 % Tax excl. Shipping costs   Supersonic Humidifier with 12 LED''s Art.Nr: 1539139 EAN: 4044499044059 Combined with a fan it will become a well-priced alternative for small rooms.  16,90 EUR incl. 19 % Tax excl. Shipping costs   Ultrasonic Cool Mist Humidifier Art.Nr: 102116 EAN: 4024102267242 1.5 Gallon tank, 380ml/h Evaporation Rate. 59,90 EUR incl. 19 % Tax excl. Shipping costs   Minifogger HR-15 with multidirectional fogging head Art.Nr: 023003 EAN: 4024102134384 HR-15 fogger produces the right humidity for your cions and plants, 230V / 50 Hz 399,00 EUR incl. 19 % Tax excl. Shipping costs