Here's another thing I hate...when a seller pukes out a bunch of "technical jargon" to convince you that the item in question is top of the line. I came across a
mercury vapor fixture today. The seller attempts to explain that his fixture is "HPF" (High Power Factor) and is more efficient than regular big box store fixtures. However, the one shown is indeed a big box store cheapo...and is NOT HPF to boot. I've bought one of them before. They under-drive lamps and are overall....cheap. So, if you read his description, you will be misinformed about "Power-Factor".