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Why so different lumen efficiencies between mains and 22V halogen?

On this page it is explained: http://www.osram.com/osram_com/news-and-knowledge/halogen-lamps/professional-knowledge/high-voltage-and-low-voltage-lamps/index.jsp The key factors are the physical properties … Some more side effects of low voltage halogen are given here: http://wiki.diyfaq.org.uk/index.php/Halogen_Lighting#Low_Voltage_or_Mains_Halogen The light will be whiter and have better colour rendition …
  • 1,276
2 votes
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95 views

Why so different lumen efficiencies between mains and 22V halogen?

I was looking for data about halogen reflectors I just bought. They are 50W, 230V. … On the package I read 320 lumen and that looked ridiculous to me, then I found this document by GE: Halogen Lamps Spectrum Catalog. …
  • 1,276
0 votes
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How does a (halogen) wound transformer dimmer work?

I'm replacing a broken halogen dimmer and I noticed that it has inside a wound transformer, but it is connected only to two leads: "input" and dimmed "output". …
  • 1,276