I forgot to ask, how are you lighting your 135w lamp? with a 135/180 watt magnetic ballast?
Did you know that it puts out as much light as a 250w HPS lamp? Run with the magnetic ballast it consumes about 185watts as compared to about 290watts for a 250w HPS lamp; with nearly same amount of light
It's in my Norelco LPS streetlight, it's rated for 135/180 lamps and has a magnetic ballast. It's in my gallery.
And I did compare the lumen ratings with other HID's. Now, to find a 180w that doesn't cost an arm & a leg (that 135w looks "small" in that HUGE light!)