The Digilume DE 1000w HPS Lamp Delivering an incredible 2100+ umol/sec, (18†distance) Specially designed and engineered for use with the Digilume DE Ballast and PAR Reflector, this is a truly integrated, professional horticultural lighting solution for the most demanding of growers. When annual plants move from vegetative into generative development, budding , flowering and fruiting, they undergo a period of dramatic morphological change. Similary, their need for PAR increases massively too.