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| Holmes |
 Posted: Sat Feb 09, 2008 11:15 am Post subject: Incandescent light bulb |
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Forum Freshman
Joined: 09 Feb 2008
Posts: 20
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Some applications of the incandescent bulb make use of the heat generated, such as incubators (for hatching eggs), brooding boxes for young poultry, heat lights for reptile tanks, and the Easy-Bake Oven toy. In cold weather the heat shed by incandescent lamps contributes to building heating, but in hot climates lamp losses increase the energy used by air conditioning systems.
http://en.wikipedia.org/wiki/Incandescent_light_bulb
i hate the new bulbs,,i remember having bulbs i suppose when raising chicks
i hate standing under the new bulbs and we dont know the health effects of them yet
congress has outlawed them
its sick! |
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| goodgod3rd |
| Posted: Sat Feb 09, 2008 12:14 pm Post subject: |
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Forum Ph.D.
Joined: 02 Feb 2005
Posts: 898
Location: Donegal Ireland
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While i support increased use for their environmental benefits, i don't like the all out ban on the original blub.
the irish green party have recently vowed to do the same thing, by 2009.
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| Bunbury |
| Posted: Sat Feb 09, 2008 2:51 pm Post subject: |
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Forum Masters Degree
Joined: 26 Sep 2007
Posts: 528
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| Quote: |
| congress has outlawed them |
No it hasn't. Congress will require light bulbs to be much more efficient for lighting, but will not mandate the use of fluorescents. There are also many exemptions, perhaps (I haven't checked) for incubators, and for home brewers to keep their brew warm. GE (and presumably others to follow) is developing high efficiency incandescents which will be an alternative to the fluorescents.
http://www.news.com/8301-10784_3-6162567-7.html |
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| Twaaannnggg |
| Posted: Wed Feb 13, 2008 2:58 am Post subject: |
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Forum Junior
Joined: 30 May 2007
Posts: 260
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| Quote: |
GE has developed a high-efficiency incandescent lamp which the lighting powerhouse said will eventually deliver the same environmental benefits as compact fluorescent lamps.
The GE Consumer and Industrials lighting division last week announced that it intends to market the high-efficiency lamps by 2010. |
I really would like to know how they wanna do this. I am in the lighting business myself and there is a snowball's chance in hell to get an incandescent bulb to deliver the same efficiency as the fluorescent. It is physically impossible. There is a certain threshhold you can acchive with the incendescents and even changing to halogen bulbs will get you an absolute maximum of 30 lumens per watt. HIDs get to 100+ lumens per watt and the best gas-dicharge bulbs will deliver 150-170 lumens per watt electrical power.
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Build a man a fire and he will be warm for a day, set a man on fire and he will be warm for the rest of his life. |
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| Bunbury |
| Posted: Wed Feb 13, 2008 9:22 pm Post subject: |
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Forum Masters Degree
Joined: 26 Sep 2007
Posts: 528
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I'd like to know too, but GE isn't saying much yet. I doubt if it is physically impossible, or they wouldn't bother trying. They mention new materials being developed. I am guessing that they are looking at filament materials that can operate hotter, possibly conductive ceramic materials like silicon carbide, because radiant emissions increase with the fourth power of absolute temperature. Then they'd have to bias the radiation towards visible spectrum and away from infra red. Maybe the gas could be changed from argon to some triatomic gas that is more opaque to IR.
Dunno, just speculating. |
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| Twaaannnggg |
| Posted: Thu Feb 14, 2008 9:13 am Post subject: |
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Forum Junior
Joined: 30 May 2007
Posts: 260
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There are not many materials you can use as a filament in incandescent bulbs. My company was doing some studies with TiN but this was a dead-end. No way to make a useful coil material from this. Way too brittle (Tungsten already confronts you with one or two process problems trying to coil it  ) and the emissivity for tungsten isn't too bad either, most of the time better than the other materials that were used for coils in ye olden times. I really don't know if they should even bother. The new CFLs (compact fluorescent) have better phosphors and are cover with a plastic so that they actually resemble "old" bulbs i.e. the color rendering index and color temperature get closer to what you are used to from incandescents. Just imagine how much you can save with the CFLs. Given, they are more expensive than standard light bulbs but they have lifetimes in excess of 5000 hrs, the incandescends generally fail after 1000 hrs. So the price is comparable, but the energy savings with 10 or more CFLs in your appartement are in the range of 100 €/year.
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Build a man a fire and he will be warm for a day, set a man on fire and he will be warm for the rest of his life. |
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| Bunbury |
| Posted: Thu Feb 14, 2008 3:28 pm Post subject: |
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Forum Masters Degree
Joined: 26 Sep 2007
Posts: 528
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| I mostly agree. My only reservations about CFLs are the mercury issue, and the on-off cycle issue. Having developed the good habit of turning off the light when leaving the room, we now have to leave the light on for at least 15 minutes to avoid drastically shortening the lamp’s life. As an industry insider what are your views on these issues? |
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