Description High pressure sodium (HPS) lamp Philips SON-T PIA Green Power, 400W Red/yellow light spectrum (2000K) Efficiency 130 lm/W PPF 700 µmol/s Lumens 56000 lm For the flowering period. Patron E40 The Philips Son-T Pia Green Power 400 W bulb with 58,500 lumens has a predominantly red and yellow color spectrum, which is required for the flowering phase. In addition, the bulb has an increased blue part of the light, which has a positive effect on the growth phase. Available for purchase: Philips Son-T Pia Green Power 400W bulb Philips Son-T Pia Green Power 600W bulb Attention: the lamp only works together with the appropriate ballast (HPS) and E-40 socket. *** Damaged packaging***