Possible consequences of GZ10 mains-voltage halogen reflector lamps for European residential energy use in 2008

		Good standard transformer		Advanced transformer
Lamp type	No of units needed to provide comparable lighting service	Yearly kWh/lamp	Energy use TWh/year	Yearly kWh/lamp	Energy use TWh/year
50 W 230V	400 million	75*	30.0	75*	30.0
50 W standard 12-V lamp	200 million	101	20.0	80	16.0
35-W IRC 12-V lamp	200 million	77	15.5	58	11.5

The calculation is based on data from Table 1. *Transformer losses not applicable.