Required PPFD (µMol m⁻²s⁻¹)	Type of Lamp	Annual Irradiance Period	Irradiance per Day	Purpose and Method
young plants: 45 - 55	HID	Oct.-Feb.	14 - 16 hrs (incl. daylight)	Improving vegetative growth, shorter culture time (2 weeks), more and better fruit production.
fruit production: 150 - 200	HID	Winter	14 - 16 hrs (incl. daylight)	Improving vegetative growth, shorter culture time (2 weeks), more and better fruit production.
seedlings and young plants: 300 - 380	HID/TL	Winter	16 hrs (without daylight)	Production in growing rooms.

PPFD for different Lamp types

The recommended irradiation level is expressed in µmol m⁻²s⁻¹ (PPFD). However, in practice, the irradiation unit lux is often still used. Therefore, the conversion from lux to PPFD is shown below. This conversion is not a constant but is dependent on light source, operating temperature, and amount of operating hours of the lamp.

• inc. - incandescent; 1000 lux is approx. 18 µmol m⁻²s⁻¹


• PL - PLE (compact fluorescent lamp); 1000 lux is approx. 13-14 µmol m⁻²s⁻¹


• TL - tubular fluorescent lamp; 1000 lux is approx. 13-14 µmol m⁻²s⁻¹


• HID - high-intensity discharge lamp (MASTER GreenPower, MASTER Agro or HPI-T Plus); 1000 lux is approx. 12-13 µmol m⁻²s⁻¹


• LED Please Vist Lux to LED PAR (PPFD) Calculator