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Old 08-04-2010, 02:26 PM   #1
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Light bulbs


Can anyone explain the difference between these two types of bulbs? One person told me one is incandescent and the other is halogen, but the person at Lithonia Lighting said they were both incandescents.


30 R20

35 PAR20
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Old 08-04-2010, 02:37 PM   #2
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Halogen IS incandescent.

The "R" is a standard reflector lamp.
THE "PAR" is a parabolic reflector lamp like an outdoor flood.

Smaller PAR (20 & 30) lamps are almost always Capsylite style halogen, while outdoor lamps (PAR38) are not always.
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Old 08-04-2010, 02:56 PM   #3
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The first one is a 30 Watt long life R20 flood light which gives you approximately +/- 20,000 hours and has a medium base.
The second one is a 35 watt par20 halogen wide flood light which gives you approximately 2,500 hours and has a medium screw base also.
Both can be used indoors and will fit in a standard household base.
A Incandescent bulb is widely used in household and commercial lighting, the very day run of the mill bulbs for portable lighting such as table lamps, car headlights, and flashlights, and also for decorative and advertising lighting. The above mentioned lights are used for specific applications.
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Old 08-04-2010, 03:34 PM   #4
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Quote:
Originally Posted by epson View Post
The first one is a 30 Watt long life R20 flood light which gives you approximately +/- 20,000 hours and has a medium base.
There is no way to tell if a lamp is "long life" or not just by it's designation.

A 30R20 is a 30 watt, Reflector lamp, that is 20 eights of an inch (1/8") in diameter.

Several factors determine long life. Many times it is manufacturing the lamp rated for 130v but designed to work on a 120v system. The light output is less than a standard 120v lamp but the life is increased.


Also, I think you have a typo there. It is 2000 hours, not 20,000.
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Old 08-04-2010, 03:40 PM   #5
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Quote:
Originally Posted by Speedy Petey View Post
There is no way to tell if a lamp is "long life" or not just by it's designation.

A 30R20 is a 30 watt, Reflector lamp, that is 20 eights of an inch (1/8") in diameter.

Several factors determine long life. Many times it is manufacturing the lamp rated for 130v but designed to work on a 120v system. The light output is less than a standard 120v lamp but the life is increased.


Also, I think you have a typo there. It is 2000 hours, not 20,000.
Thanks for the clarification Speedy. So, if you were to order bulbs for the dining/living room area, which ones would you get? I plan to order the Lithonia 301 trim with the L3R housing.
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Old 08-04-2010, 03:53 PM   #6
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I like the light better from PAR lamps. It is generally a crisper, whiter light.
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Old 08-04-2010, 03:55 PM   #7
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PAR = Parabolic Aluminized Reflector

Quote:
Originally Posted by hgtv View Post
bulbs for the dining/living room area
You want the food to look natural so color temp. is important.

halogen = "incandescent except that a small amount of a halogen gas has been added to the inside of the glass envelope"

"High-quality halogen incandescent lamps have higher efficacy, which will allow a 60 W bulb to provide nearly as much light as a non-halogen 100 W. "

The color temp is also different with halogen.
http://en.wikipedia.org/wiki/Halogen_lamp

Last edited by Yoyizit; 08-04-2010 at 04:15 PM.
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