Im no lighting expert but, are you running a converter too?
....I have MH's and when i would go to full on my converter one of my lights would do exactly what your HPS is doing. I simply got rid of one of 150 watt halogens at the back of my boat and haven't had a problem since.
....I have MH's and when i would go to full on my converter one of my lights would do exactly what your HPS is doing. I simply got rid of one of 150 watt halogens at the back of my boat and haven't had a problem since.