Philips 600w Master Son-T Pia Green Power is one of the best HPS lamps you can buy! High Pressure Sodium lamp with clear tubular outer bulb, high output and long reliable lifetime A premium full spectrum bulb and a high end option for great results throughout your grow.
Much more reliable than standard HPS lamps and gives a higher output for longer, meaning less lamps changes for optimum results.
Not suitable for 400v ballasts