just got a 400 watt techone ballast and hps bulb/reflector and when i turn it on the light flickers a bit then its fine for a couple of mins untill it starts to make a high pitched noise from the bulb! as the pitch changes so to does the flickering..almost like a subtle strobe effect. any ideas anyone? cant get another bulb to test until tuesday n im a bit worried about using it

strange check all ur connections and wiring and check the bulb is screwed tight


altho ive nevered heard of a bulb squealing before

techone ballasts are a bit dodgy. The only ways to test are to get a new lamp and/or a new ballast .

hey thanks man..its really high pitched almost un audible! yeh i didnt want the techone but had a lighting crisis already and the only place around didnt have anything else..200 bloody euro too. tried the usual.. different circuit ..bulb tightness. it is a cheap ass bulb they gave me aswell..euro cn or something. will try to report back if i get it sorted. thanks again

my lightwave 6oo's do this for the first min then go quiet I was worried @ first but they seem fine..