Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 05-10-2013, 06:31 PM   #1
Newbie
 
Join Date: May 2013
Posts: 7
Rewards Points: 10
Lightbulb

General question about cost/energy use of additional lightbulbs to a ceiling light


Hi.
When I talk about the light, i am referring to a regular bedroom ceiling light that you would flick on with a switch on the wall.
I was wondering if someone could explain if there is a difference in price and energy used when you add a lightbulb to a ceiling light fixture that can input at most 3 light bulbs.

So if i originally had 1 light bulb in place and didn't use the other two spaces, would it be cheaper then having 2 light bulb's in place, leaving the third space unused.

Here's a sample picture.https://www.google.ca/search?q=ceili...-6%3B894%3B894
A detailed explaination would be appreciated

EDIT:When I talk about the light, i am referring to a regular bedroom ceiling light that you would flick on with a switch on the wall.

popo619 is offline   Reply With Quote
Old 05-10-2013, 06:45 PM   #2
Remodel and New Build GC
 
MTN REMODEL LLC's Avatar
 
Join Date: Sep 2010
Location: Colorado @ 7651'
Posts: 2,866
Rewards Points: 2,002
Default

General question about cost/energy use of additional lightbulbs to a ceiling light


I don't work or pay attention to the POCO.... but yes... as a "rough" guess
one light bulb costs about 1/3 the cost of three, 2 light bulbs cost about 2/3 the cost of 3, and three lightbulbs cost exactly 3/3 of three light bulbs.

(generally for lights seldom used, the cost is relatively nominal/small.... but everything adds up, and CFL's and
LED's cost significantly less than standard incadesents EDIT;to operate.)

PS: I am a CPA and pretty sure of my answer.

__________________
Never stop learning (xcep fer speling en typeing)

Last edited by MTN REMODEL LLC; 05-10-2013 at 11:32 PM.
MTN REMODEL LLC is offline   Reply With Quote
Old 05-10-2013, 07:01 PM   #3
Electrical Contractor
 
jbfan's Avatar
 
Join Date: Jun 2004
Location: Newnan GA
Posts: 5,859
Rewards Points: 2,114
Default

General question about cost/energy use of additional lightbulbs to a ceiling light


Of course 1 lamp will use less energy of 2 lamps, as long as they are rated the same wattage, and 2 will use energy than 3.
The difference on the electric bill will be negligible.
__________________
Yes I am a Pirate, 200 years too late. "Jimmy Buffett"
jbfan is offline   Reply With Quote
Old 05-10-2013, 07:26 PM   #4
Remodel and New Build GC
 
MTN REMODEL LLC's Avatar
 
Join Date: Sep 2010
Location: Colorado @ 7651'
Posts: 2,866
Rewards Points: 2,002
Default

General question about cost/energy use of additional lightbulbs to a ceiling light


Quote:
Originally Posted by jbfan View Post
Of course 1 lamp will use less energy of 2 lamps, as long as they are rated the same wattage, and 2 will use energy than 3.
The difference on the electric bill will be negligible.
JB.... wasn't gonna get that technical... nor factor in the inherent heating factor/air conditioning variables as to final cost.
__________________
Never stop learning (xcep fer speling en typeing)
MTN REMODEL LLC is offline   Reply With Quote
Old 05-10-2013, 11:28 PM   #5
Newbie
 
Join Date: May 2013
Posts: 7
Rewards Points: 10
Default

General question about cost/energy use of additional lightbulbs to a ceiling light


thanks a lot guys
popo619 is offline   Reply With Quote
Old 05-11-2013, 05:09 AM   #6
JOATMON
 
ddawg16's Avatar
 
Join Date: Aug 2011
Location: S. California
Posts: 7,487
Rewards Points: 2,316
Default

General question about cost/energy use of additional lightbulbs to a ceiling light


It's a pretty simple thing to calculate.....

Look at the bulb wattage....actual wattage.

If you have a 65w bulb....if it's incandescent...it will put out 65 watts of heat energy....give or take a watt or two. If you have a 23w CFL...it will put out 23 watts of heat energy....give or take a watt or two....but...it will put out as much light as a 100w incandescent bulb.....

If you put 3 60w bulbs in a light fixture....you will have the equivalent of 180 watts of heat energy.

Simple math

Or put it this way....each watt of electrical energy a bulb uses is equal to 3.4 BTU's of heat. So a 100w bulb is going to give you 341.24 BTU's
__________________
"The dream is free but the hustle is sold separately."

My 2-Story Addition Build in Progress Link ... My Garage Build Link and My Jeep Build Link
ddawg16 is online now   Reply With Quote
Old 05-11-2013, 08:33 AM   #7
Member
 
Join Date: Oct 2011
Posts: 173
Rewards Points: 150
Default

General question about cost/energy use of additional lightbulbs to a ceiling light


Quote:
Originally Posted by popo619 View Post
Hi.
I was wondering if someone could explain if there is a difference in price and energy used when you add a lightbulb to a ceiling light fixture that can input at most 3 light bulbs.

So if i originally had 1 light bulb in place and didn't use the other two spaces, would it be cheaper then having 2 light bulb's in place, leaving the third space unused.

Did you really ask if it is cheaper to burn one light bulb as compared to two light bulbs? Wow

If I only drink one 12oz can of beer will I have less beer in my body than if I drink two 12oz cans of beer?
Minus08 is offline   Reply With Quote
The Following User Says Thank You to Minus08 For This Useful Post:
RWolff (05-11-2013)
Old 05-11-2013, 10:18 AM   #8
Licensed electrician
 
Join Date: Sep 2007
Location: Maryland
Posts: 7,695
Rewards Points: 2,188
Default

General question about cost/energy use of additional lightbulbs to a ceiling light


I don't know if someone was trolling or is this a sad commentary on the educational system. Is 1<2<3?
__________________
Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
Jim Port is online now   Reply With Quote
The Following 2 Users Say Thank You to Jim Port For This Useful Post:
RWolff (05-11-2013), Speedy Petey (05-11-2013)
Old 05-11-2013, 10:58 AM   #9
Remodel and New Build GC
 
MTN REMODEL LLC's Avatar
 
Join Date: Sep 2010
Location: Colorado @ 7651'
Posts: 2,866
Rewards Points: 2,002
Default

General question about cost/energy use of additional lightbulbs to a ceiling light


Quote:
Originally Posted by Jim Port View Post
I don't know if someone was trolling or is this a sad commentary on the educational system. Is 1<2<3?
Jim.... You know I was thinking the very same thing when I ever answered the lady.... I wasn't sure.... and answered a little facetiously, although not too outlandishly.

I'm afraid it wasn't a troll.

Peter
__________________
Never stop learning (xcep fer speling en typeing)
MTN REMODEL LLC is offline   Reply With Quote
Old 05-11-2013, 11:34 AM   #10
Licensed Electrical Cont.
 
Speedy Petey's Avatar
 
Join Date: Feb 2004
Location: NY State
Posts: 6,864
Rewards Points: 2,032
Default

General question about cost/energy use of additional lightbulbs to a ceiling light


I have come to realize there definitely are people in our society that know absolutely nothing about electricity, how it works or how it is billed/costs.

Yes, leaving one light bulb out of a three lamp fixture will use less than all three, provided the wattage of those lamps is the same. Thing is wattage comes into play. Using two 60's in place of three 40's will obviously be exactly the same light and wattage used.

So simply asking if leaving one light out of three will save you anything, the answer is there is no answer.
Even so, leaving one 60W bulb out in a 3-lamp fixture will save you so much over the course of a year that you MIGHT be able to buy one of those beers Minus was talking about. By this I mean at the beer distributor buying them buy the 30-pack. NOT buying one at a major league ball game.
__________________
Sometimes I feel like if I answer any more questions it is like someone trying to climb over a fence to jump off a bridge and me giving them a boost.
Answers based on the 2008 & 2011 NEC.
Speedy Petey is offline   Reply With Quote
The Following User Says Thank You to Speedy Petey For This Useful Post:
RWolff (05-11-2013)
Old 05-11-2013, 11:55 AM   #11
Remodel and New Build GC
 
MTN REMODEL LLC's Avatar
 
Join Date: Sep 2010
Location: Colorado @ 7651'
Posts: 2,866
Rewards Points: 2,002
Default

General question about cost/energy use of additional lightbulbs to a ceiling light


Quote:
Originally Posted by Speedy Petey View Post
I have come to realize there definitely are people in our society that know absolutely nothing about electricity, how it works or how it is billed/costs.

Yes, leaving one light bulb out of a three lamp fixture will use less than all three, provided the wattage of those lamps is the same. Thing is wattage comes into play. Using two 60's in place of three 40's will obviously be exactly the same light and wattage used.

So simply asking if leaving one light out of three will save you anything, the answer is there is no answer.
Even so, leaving one 60W bulb out in a 3-lamp fixture will save you so much over the course of a year that you MIGHT be able to buy one of those beers Minus was talking about. By this I mean at the beer distributor buying them buy the 30-pack. NOT buying one at a major league ball game.

Speedy.... or you could drink the crap I do.... and get three.

Peter
__________________
Never stop learning (xcep fer speling en typeing)
MTN REMODEL LLC is offline   Reply With Quote
Old 05-11-2013, 01:05 PM   #12
Architectural Sculptor
 
RWolff's Avatar
 
Join Date: Jan 2013
Location: USA, Midwest
Posts: 765
Rewards Points: 500
Default

General question about cost/energy use of additional lightbulbs to a ceiling light


I am switching over to the Cree LED bulbs after reading some great reviews and testing results on them, I bought 4 last week for the two front pendant lamps at my gallery which are left on all the time, they are 60 watt equiv and use 9.5 watts each, shaped like an incandescent bulb they are for all intents and purposes indestinguishable from incandescents.
They also come with a 10 year warrantee.
I shopped around and found them at Home Depot for only $12.97 (Amazon's lowest price was $18) and with a $45 total order there is free shipping, so I bought 4 to get the free shipping.

The two lamps take 3 bulbs each but I only put 2 in, that's 36 watts for the 4 bulbs, v/s the CFL's I had in them which used 26 watts each, it's easy to do the math 26 x 2 (I only had one CFL in each) is 52 watts, now I have 4 LED bulbs putting out 240 watts of light using only 36 watts of power, saving 16 watts in the process.
Were I to put 4 incandescent bulbs in, 60 watts x 4= 240 watts used per hour instead of 36, a big difference!

Realistically, lights don't use much or add much to an electric bill, it's all the other stuff that runs it up- the water heater, furnace, baseboard heaters, dishwasher, clothes dryer, fridge, A/C.
I pay 7.5 cents a kwh, the saving of 16 watts is miniscule, but I got the LED bulbs for reasons other than to reduce total wattage use, the lower power use is just a side bonus.
RWolff is offline   Reply With Quote
Old 05-11-2013, 02:06 PM   #13
Member
 
Oso954's Avatar
 
Join Date: Jun 2012
Location: Northern Calif.
Posts: 1,639
Rewards Points: 1,152
Default

General question about cost/energy use of additional lightbulbs to a ceiling light


Quote:
Realistically, lights don't use much or add much to an electric bill,
Not in your case, because you picked up most of the savings when you switched to CFL.

There are still a lot of people running incandescent bulbs that could benefit by switching bulbs to more efficient bulbs.
Oso954 is online now   Reply With Quote
Old 05-11-2013, 02:18 PM   #14
Member
 
joed's Avatar
 
Join Date: Mar 2005
Location: Welland, Ontario
Posts: 7,854
Rewards Points: 2,502
Blog Entries: 4
Default

General question about cost/energy use of additional lightbulbs to a ceiling light


It depends. It's all about the watts(the real watts not the equivalent watts of CFL). If the total watts of the new two bulbs is more than the watts of the single bulb then it will use more power. If the total watts is less than the one bulb then it will use less power.
If you put in another light bulb the same size as the first one it will use twice the electricity. If you remove the first light bulb and install two bulbs with half the wattage of the one you removed it should use the same amount of power as one light bulb that was removed.
__________________
Do not PM with questions that can be asked in a forum. I will not respond.
joed is online now   Reply With Quote
Old 05-11-2013, 03:35 PM   #15
Member
 
Join Date: Jan 2012
Location: Pittsburgh, Pennsylvania
Posts: 174
Rewards Points: 150
Default

General question about cost/energy use of additional lightbulbs to a ceiling light


Okay, So I understand the simplicity of the OP's question but I have a similar question.

Say I have a 4 tube 48" flourescent fixture. Is it cheaper to only put 2 tubes in or does it use the same amount because the ballast is still trying to power the missing tubes? I understand it will be less due to the actual wattage of the tubes not being there but dose the ballast use electric trying to power the missing tubes? Also, will this damage the ballast?

Thanks,
Rick

bcgfdc3 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Installed Ceiling Fan Light Kit - No Lights soulstar Electrical 10 11-09-2011 11:35 AM
Light Wiring Question mataguri Electrical 4 11-09-2011 02:15 AM
Quick Question about Ceiling Fan LIGHT KITS watts up? Electrical 8 10-05-2011 11:04 PM
Light fixture in ceiling fan won't work. Tested DIYself Electrical 7 11-28-2010 11:52 AM
Help- cant get a new ceiling fan light to work boddabing Electrical 6 08-26-2010 05:24 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.