why the normal bulb colour is yellow not white?
475042
Incandescent bulbs are yellowish becuase they are not really that efficient in generating white light, they are better at generating heat. The bulb lights up becuase of the heat of light and as it gets hotter it goes through the electromagnetic spectrum: purple-blue to greennish yellow, red-orange and then white. However as incandescents wear out they dont produce white light anymore and produce yellowish light.
982551
Halogens are quite yellow compared to the more modern lights of today(LED, ARC's) so while they may have seemed very bright ten years ago they have just aged a bit but are not any less efficient. You could upgrade the bulb if you want to although it would eat in to your running time.
518377
Regular (incandescent) bulbs do not emit UV light like fluorescents do. Firstly, the filament temperature is not high enough to permit it to cast UV light.\nSecondly, the glass envelope surrounding the filament is usually made of non-quartz glass which attenuates the UV light.\nThe mercury vapor in fluorescents when excited by electrons, produces + UV light which causes the coating on the inside of the glass envelope to fluoresce thereby producing light.\nBe aware that serious damage can occur to the retina of the eyes if they're so exposed to this light.
818868
I suspect this refers to how flourescent light bulbs generate a quasi-continuous spectrum as opposed to the discrete emission lines like other self respecting plasma discharge tubes.  \n\nHere is a website that has several pages on Flourescent Lamps:\n\nhttp://home.howstuffworks.com/fluorescent-lamp.htm\n\nThe first two or three are the ones useful to you.  Also there are several links on the last page under More Great Links that will help you in your researches.  Happy hunting!\n\nBTW: This reeks of an intro science class lab write-up question.  TAs at help desks or profs during office hours can help a great deal more effectively than something like yahoo answers, if you want to truly understand.
829536
The sun actually glows white-hot, so we can't look at it with the naked eye. When we do manage to get a glimpse, it appears yellowish. When it's rising or setting, it may appear orange or reddish, because of the bending of light rays.
763687
What are you blind? it's yellow.....whoa didn't actually expect other answers to be yellow
928161
OK, this question doesn't make sense, for two reasons:\n\n1.) Colors, by definition, are at different wavelengths. If the beam has 2 color components, each component would have it's own wavelength.\n\n2.) Your question at the end isn't a proper sentence, and is leaving a necessary part out.
814724
I know what you mean, you don't want to know why it is changed into the full spectrum due to that the different colours retract better than others but why it does, well i think it is done at random!
438306
The color is absorbed in the body and our bloodstream. Its yellow is the urea from our kidney. If you drink enough water it wont be as yellow.
952096
Mine is naturally clear. I do, however, drink lots of water daily, which will dilute it. If I cut down on my water intake, I make less trips to the toilet, & my wee is stronger & more concentrated, which makes it a more yellow colour.
951468
There are a number of products on the market that will do what you want, and be certified and safe.\n\nMake sure you get a warm LED though: cool white LEDs produce a terrible colour of light.\n\nhttp://www.theledlight.com/120-VAC-LEDbulbs.html
677042
BENT  WHITE  LIGHT     :  )
791078
I suppose the answer is ultaviolet but as it is outside the visual spectrum of elctromagnetic radiation I can't see how you could define it as a coloUr.
681686
Na emits light at a primary wavelength of 589.0 nm (plus at a couple other wavelengths).  This light is a characteristic orangey-yellow, and is what makes street-lamps the colour they are, since many of them are sodium lamps.
891319
That is one of the reasons why.  The red light given off by those lamps not only helps make the body have a better appearance and look like it has more color, but is also enhances the make-up that hte mortician used on the body.  Another reason is that soft red light has a generally calming affect on people.  It may creep you out, but to alot of people it is a rather soothing color.  Stark white light is too sterile feeling to use, blue is too cold feeling, and the average amber color that most bulbs glow will not enhance the look of the body in the same way.  Light has a whole lot to do with making something look better or worse than it is as well as affecting the moods of the people in the area.
214578
It will be used in reference to a prism.\n\norange light has more wavelength thanx yellow.
934027
I'd probably choose luminescent due to the cheapness and effectivity of the lightbulb; I personally don't like the light a incandescent light bulb gives off.