The incredible and powerful Philips MASTER bulbs boast some of the greatest features weve ever seen in any lamp on the market, the results really do speak for themselves on this one. They last ages too, theres about a 1 year life expectancy on these without any loss of power or quality, making them a very cost effective option when upgrading your gear. Prevents stretching Encourages much higher quality growth More natural formation of branch internodes for increased plant mass Ideal as both supplementary and stand alone lighting Highly efficient - puts out 1.9 micromole (umol) per watt of electricity Extremely high PAR levels Great for the vegetative stages with the Philips Green Power Elite Agro lamp