Ian Thompson asks why it is that some fluorescent lamps vary in brightness along the tube when first switched on. It is answered by OSRAM (theme - Lighting):
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Question: Could you please tell me why some fluorescent lamps, when turned on, are bright at the ends - slowly going brighter towards the middle? This is so even when they are new tubes, yet others are full on straightaway.
Is it the lamp? Or is it caused by poor quality switchgear, or a choke on its way out?
Answer: This is common when the fluorescent tubes have been moved about, ie: when replacing a failed tube with a new one.
Once the tube has stabilised, this effect becomes invisible. Another possibility is if lamps using amalgam technology are installed - while they have a superior thermal operating range, they can take longer than standard lamps to run up to full output.
To see many more Q & A in Voltimum UK's Experts Area, please click on the link: www.voltimum.co.uk/consult.php?universe=consult.index.questions
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