Bulb advice

Posted by: count.d on 06 December 2014

I have just bought an antique illuminated globe (map). It still has the original tungsten bulb inside, but I can see with the long term use, the heat has caused a tiny bit of ageing of the map. I'm thinking of keeping this bulb in a box replacing it with a low energy one, which will produce less heat.

Does anyone know if a led or fluorescent bulb will produce less heat? Will either of these low energy bulbs produce uv light that could fade the map? Or any other issues.

Thanks.

Posted on: 06 December 2014 by tonym

Hi count.d. An LED's your best bet, much lower heat output ( it converts most of the electical energy to light not heat). You just need to check the physical size vs. wattage; some LEDs are rather larger than their incandescent counterparts & won't always fit. No issues with UV, they've a narrower band of light emission.

Posted on: 06 December 2014 by Erich

Try with 1/10 to 1/6 of the tungsten's watts.

Regards. Erich

Posted on: 06 December 2014 by Mike-B

http://www.simplyled.co.uk/

These folks have most shapes & sizes of LED around & its www shopping

Find the existing bulb watts, then you can find that wattage for Lumens, you can find that info on the www knowledge & spec pages, then find an LED lumens match.

The smallest is around 1.5W (heat) & it gives aprx 135lumens,

Posted on: 07 December 2014 by count.d

Thanks chaps. I'll go with the led route, as it's the heat and uv I'm worried about.