Re: New bulbs.
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Re: New bulbs.
I must say that the figures I've seen always quoted 10X lifespan.
No ones mentioned the mercury yet................ |
Re: New bulbs.
Jambutty, do you accept the physics behind my post informing you about the different frequencies that can be used with solar cells and hence the reason why your calculator dosn't work with LE bulbs, rather than it being less bright?
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Re: New bulbs.
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http://www.classzone.com/books/earth...u501page04.cfm |
Re: New bulbs.
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The bottom line is that my calculator will be activated by light from any source and it is the brightness (or amount measured in lumins) of light falling on the solar panel that will determine at what point the calculator will become operative. Where the light comes from or what colour it is, is irrelevant. The blue end of the spectrum has more energy than the red end and therefore I conclude that more energy means a brighter light. With a 10% differential between the outer limits of the spectrum as shown by http://www.iee.cz/iwtpv04/6-Pociask.ppt slide number 32 it is hardly a major factor. In any case the point being made applies to, presumably, a modern solar cell. My calculator is more than 20 years old. |
Re: New bulbs.
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There's statistics and theres life. I know whos side I'd bet on |
Re: New bulbs.
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However according to the packaging on a General Electric LE bulb (normal price £3.50 reduced to £1.75 at Asda) on side of the box it quotes; “Lasts 6 years, if used for 2.7h per day.” Thus ignoring leap years, 365 x 6 x 2.7 = 5913 hours. Near the bottom of the same side it reads: Last longer – 6 times longer than normal bulbs. I still prefer classical cousins to normal bulbs. It also states: Saves energy – uses 80% less electricity. Interestingly this particular 15w LE bulb is sold as an equivalent to a 75w classical cousin and the box also quotes the lumens. 799Lm for the LE and 820Lm for the classical cousin. Not a huge difference and probably not discernable by the naked eye but it doesn’t fool a solar panel on a calculator. So if proof were ever needed that an LE bulb does not give off as much light as a normal bulb General Electric has supplied it. The box also reveals that the LE bulb should not be used in conjunction with a timer or dimmer switches. Why not a timer I wonder? The box also goes on to declare that an LE bulb should not be used in “enclosed or recessed fixtures” because it could reduce its life. That’s about all of the fittings in a house if you include lampshades. LE bulbs are looking less of a bargain than is being claimed. The 60w hot filament bulb box reveals that it delivers 700 lumens for a life of 1,000 hours. It also declares that the bulb is fused for extra safety. That would explain that every time that the bulb dies it always take the plug fuse. However a rated 60w LE bulb (actual 11w) from Philips lasts for 6 years according to the box and uses 5 times less electricity to operate. I measured the current of the 60w normal bulb and it was 200mA whereas the current drawn by the LE bulb was 20mA. On the top of the box it states 6,000 hours, 600 lumens, 80 mA. 80mA? Maybe my multimeter is dicky? But to be so far out? It is unlikely. So there again if proof were ever needed, an LE bulb gives off less light than a normal bulb. And that is what I stated at the outset and did so on the observation that my calculator had to be brought closer to the source for a LE bulb than for a normal bulb for it to work. P.S. I don't want to talk about mercury arc lights. |
Re: New bulbs.
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Re: New bulbs.
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Re: New bulbs.
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Unless you can prove otherwise, stop denouncing scientific fact. The colour of the light DOES matter. It explains EXACTLY what is going on and why your calculator works less well with LE bulbs even though they're the same brightness. How can you just conclude otherwise going against physics, unless you happen to have proof. It is a major factor, it is the single factor that explains why your calculator works differently under two bulbs (of the same brightness). Ps. Your whole assumption that 'it has more energy so it must be brighter' would mean LE lightbulbs are actually brighter than normal ones so don't prove yourself wrong in the same thread. Just accept science. For once. |
Re: New bulbs.
Maybe he could try placing coloured filters over the solar cell and see the effect with both types of lamps.
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Re: New bulbs.
B'Jesus I'm sorry I started this thread....headaching now!:confused:
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Re: New bulbs.
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Re: New bulbs.
and your a stir-rer sir!
or is it all that mercury in landfill thats got into Ossies water supply :D |
Re: New bulbs.
Maybe thats what is wrong with those that live around Whinny Hill :D
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