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OT free lighting
On Wed, 14 Aug 2013 17:59:31 +0100, Chris Hogg wrote:
If a bottle delivers say 50 watts of light, then each bottle will have to have a cross-sectional area of 50/0.045 = 1110 cm^2, or a diameter of about 37.6 cm. So they'd have to be even bigger than Jeff suggested, which makes me think the estimate of 40-60 watts is somewhat exaggerated. I think you are missing an efficiency factor. I suspect the light you get from the pop bottle is similar in level to that which you get from a 40-60 watt tungsten incandescent bulb. Incandescent light bulbs are horribly inefficient, less than 5%. Reversing the calculation, a 2 litre pop bottle has a diameter of about 9.5 cm, so a cross sectional area of about 71 cm^2, and would give a visible light output of 71x0.045 = 3.2 watts. 3.2 Watts of real light or 64 Watts of incandescent assuming 5% efficiency. Most incandescent bulbs won't be that efficient... -- Cheers Dave. |
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