Category	Details
Plant Species	Aster (Chinese Aster) young plants
Required PPFD (µMol m⁻²s⁻¹)	40 - 50
Type of Lamp	HID
Annual Irradiance Period	Jan.-March
Irradiance per Day (incl. daylight)	6 hrs, followed by short days
Purpose and Method	Improving vegetative growth and floweradvancement. Short days after buds become visible

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