http://mrmackenzie.co.uk/2006/09/06/lamps/ with mr mackenzie Tue, 01 May 2012 14:36:05 +0100 hourly 1 http://wordpress.org/?v=3.3.2 http://mrmackenzie.co.uk/2006/09/06/lamps/#comment-207 James Reid Fri, 08 Sep 2006 21:15:30 +0000 http://mrmackenzie.co.uk/2006/09/06/lamps/#comment-207 The envelope of a halogen bulb is made of quartz. This is so it doesn't melt. The filament is made of tungsten. The envelope is filled with a gas from the halogen group as opposed to argon. If the bulb gets hot enough, the tungsten atoms and the halogen gas combine. This causes tungsten atoms to settle back on the filament. This recycling process means that the bulb lasts longer and is more energy effiecient. You can get more light per one unit of energy. from James R The envelope of a halogen bulb is made of quartz. This is so it doesn’t melt. The filament is made of tungsten. The envelope is filled with a gas from the halogen group as opposed to argon. If the bulb gets hot enough, the tungsten atoms and the halogen gas combine. This causes tungsten atoms to settle back on the filament. This recycling process means that the bulb lasts longer and is more energy effiecient. You can get more light per one unit of energy. from James R

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