Thought I had this resolved, but I found how mistaken I was. I seek understanding here. I had been given a 600 Watt Harvest Pro ballast by a friend who told me that it was striking intermittently. I ordered a new cap and ignitor from Atlas. After installing them, I was able to ignite a MH bulb, but not a hps bulb. I ordered a new ignitor from ilighting, and that seemed to work fine. That is to say that when I wired the socket directly to the ignitor, the hps bulb will strike really fast, a second or maybe 2 at the most. Yet when I attempt to use the standard remote cord set and hood, I could not get the hps bulb to strike. I did not think to try the mh bulb. Wish now that I had tried it . I did try a couple of things at that point. I did wire the bulb back up to the ignitor again, it strikes fast and fine. I grabbed a multi meter and found no short or opens in the hood or cordset. At that point, I figured that my problem was that I had too much resistance for the ignitor, so I pulled off the ignitor and ran extension wires to extend the ignitor to the hood. I wanted to make sure that I was using heavy enough wire, so I used 18 g and what ever it is that is one step thicker. It made no difference at all, no strike. Yet when I wire the ignitor and bulb back up directly to the coil,the hps bulb strikes instantly. The ballast was marked :BAHPS 600 CW Autotransformer 600 W S106 Lamp, 64 mfd cap 300 V . The original cap was 64mfd and 300 volts and the replacement was the same. The original ignitor was marked: for 250 - 600 Watt hps , or 35- 150 mh Ballast 105C max case temp 2 foot max lamp to ballast . The ignitor I got from Atlas that did not work was marked : Ignitor BI 802 , for 200 - 600 Watt hps or 35- 450 Watt MH Ballast, 2 ft max lamp to ballast , 105 Max case temp . The 2nd ignitor which I bought when that first replacement did not work was from Ilighting, and was marked: Keystone XGO6 HPS 600 W, Max case temp 105. It is the Keystone ignitor which seems to work but only when wired directly to the ignitor and coil. I think I must be overlooking something very basic. I would like to have the bulb on a cord about 12 Feet long, but could make it work just fine with a 6 foot cord. For some reason, I am having a hard time contemplating running the thing with the socket hanging off the side of the ballast. Any insight would be appreciated.