My MH conversion bulb takes a few seconds to fully ignite...My HPS light turns on immediately as soon as I hear the click of the timer...Both of my ballasts are HydroFarms...I don't know the model name of the 400 but the 600 is a HydroFarm "Power House"...:stoned:
DTRave420 Reviewed by DTRave420 on . Q about hps ignition i just bought an old 400 watt hps system and im not sure if it works or not because i plug it in and all i can hear is the buzz of the ballast but the light does nothing i have only had it plugged in for a few seconds because electricity kind of scares me and im affraid of getting electrocuted or starting a fire. how long does it take for a 400 watt hps to start giving off light? i know my 150 watt hps would let you know right away when you plug it in. Rating: 5