Re: New bulbs.
well i know sod all about this,but looking and reading jambuttys link,he seems to be correct with the colors cyfr.:)
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The high energy blue/violet light dosn't work very well with solar panels, where as red light does. Pretty pointless being high energy if it dosn't work! Jambutty just failed to link the knowledge he found to our situation, cause i'd already said blue light dosn't work, its energy dosn't matter, because the energy isn't the reason it dosn't work. ps. check the graph link on my other post. The bottom of the graph indicates the light colour.. the left side is violet then it works its way to red on the right. It shows that red is more efficient. :) |
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Re: New bulbs.
I like janbutty Neil spent all or most of my life from leaving school in the electrical trade, I personally do not understand some of the things discussed in this thread, but if you place a 'clip on' ammeter round the phase being used you will see the proof of my old wives tale.
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I was having a quote at work from a lighting engineer a few months ago for zoning some florescent lights so they could be automatically turned on and off as needed to save electricity. He also said that start up current equates to only a few seconds of running power on modern florescent lamps and that they should be turned off when not needed. |
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Re: New bulbs.
Everything changes (except maybe transformers). The latest high frequency florescent tubes are only about 15mm in diameter. They will eventually replace the current ones. I am told that 8' fittings are being phased out as well.
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Nope they do as well, into cars, boats, planes.............(Robots in disguise........) OK, I'll get me coat :D |
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Re: New bulbs.
Hello all. Long time no see. Been at uni in manchester studying... physics. I just felt that the physics being used was sketchy at best. Lack of clear reliable sources meant that confusion is everywhere and I hoped I might be able to clear up the matter somewhat.
I think most people are happy that flourescent bulbs do not produce as much heat (infrared radiation) as their classical cousins. Simply by looking at the two types of bulb (without the aid of a prism/magnifying glass) you can see that the Energy saving bulbs (Compact Flourescent Lamp or CFL for short) emit bluish white light (http://en.wikipedia.org/wiki/Image:CFBulbs.jpg). Since the human eye can only view light in the visible spectrum (with wavelength from about 350 - 750nm. Your mileage may vary though) any light emitted outside this range is wasted (for viewing purposes by the human eye). Thus, by converting electrical energy into only visible light (rather than infrared as well) the CFLs are more efficient at lighting and thus require less energy per second (power). In this way, 20 Watts of power can produce the same amount of visible light as an equivalent 100 Watt bulb. Light is composed of discreet packets of energy (quanta) known as photons. Each photon has a set energy which is related directly to its frequency by the equation Energy = hc/wavelength (where h is Planck's Constant and c is the speed of light). A photon of Blue light (wavelength=400nm) therefore has more energy than a photon of red light (wavelength=700nm). http://www.howstuffworks.com/solar-cell4.htm (stated as a reliable source previously) says that the energy of photons falling on a crystalline silicon solar panel must be 1.1 to 1.4 eV of Energy which corresponds to a wavelength of 885 - 1127nm. As you can see on this image of the electromagnetic spectrum, these wavelengths lie in the infrared end of the spectrum. Any other photons are wasted. Thus the frequency of the light is paramount to the effectiveness of the calculator's solar panel. Having said all that, I live in university halls and hence have no choice about the light bulbs used in my room. I think it's a CFL covered with some sort of protective cover that blocks out a ton of the light, so I can't comment on whether the things are actually as bright as they say they should be. It's possible that the manufacturers are using theoretical equivalance values which may not be applicable in practise. I'd also expect the Energy saving bulbs to be far more cost effective. Assuming that we leave both bulbs on for 10,000 hours, we'd need to buy 10 incandescant bulbs and one Energy saving bulb. Taking the price of an incandescant bulb to be 50p and an energy saving bulb to be £3.50 we've saved money already without even considering the electric bill! Taking a cheap price of electricity of 5p per kilowatt hour gives that the energy saving bulb (25W) uses £12.50 and the equivalent incandescant bulb (100W) uses £50 of electricity. Obviously you don't leave the bulbs on all day and all night, but the point is there. Finally, I find the response of various people to global warming and environmental damage to be quite shocking. Global warming is no fictional device created to make money! It's a fact. Just like people used to deny that smoking is dangerous to your health. Tackling the situation will require radical action. Complaining at being told to replace your lightbulbs to conserve energy, time and money is just daft. Why fight it? Replace your bulbs, save money, save time and save your children's future. References: http://www.howstuffworks.com/solar-cell4.htm http://en.wikipedia.org/wiki/Electromagnetic_spectrum http://www.est.org.uk/myhome/efficie...g/bulbratings/ |
Re: New bulbs.
My white flag is now definitely up now, I surrender.:cool:
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P.S. The blue bulb will permit infrared emission to occur. Just touch the bulb to see how hot it gets. This heat will be radiated and used to power your calculator explaining why it works. Your lighter also emits infrared radiation as will your computer screeen.
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Global warming may not be a fictional device but the 'evidence' that it is us that is causing it is not as yet proven. The world has and will continue to go through major climate changes as time progresses.
Interestingly as a result of global warming we in the UK are more likely to experience colder weather due to the dilution of the sea affecting the North Atlantic drift which keeps us artificially warm. |
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