I find it interesting that they kept the same designation for the light source (500 H) even though they changed the lamp amps output. In my case the head, 500 H, has 300 watt bulb but the plug for it has all slotted pins and no round pin. The head came from Canada and the rest of the system from the USA. Someone suggested that may be the reason for the difference because the use a different electrical system (?). I don't know but it's an interesting explanation. I haven't heard from anyone who has the 150W system to confirm that their pins are the slotted kind. Thanks for the reply and pics. How long have you had your system?
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