Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




3284 posts

Uber Geek


#220207 31-Jul-2017 15:21
Send private message

Purely academic question that I'm trying to get to the bottom of just for my own interest:

 

Halogen bulbs are apparently more energy efficient than incandescent bulbs, but they apparently also run hotter. How can this be the case?

 

If they are more energy efficient then that means that more of the energy is going into generating light, the counter of that surely being that they generate LESS heat?





 Home:                                                           Work:
Home Work


Filter this topic showing only the reply marked as answer Create new topic
16231 posts

Uber Geek

Trusted
Subscriber

  #1834396 31-Jul-2017 15:34
Send private message

They may put out more light per watt consumed, but I don't think they can put out more light and heat. All electrical power turns into heat when used in this way at 100% efficiency. The only question is distribution.


4797 posts

Uber Geek


  #1834405 31-Jul-2017 16:10
Send private message

In totality the "heat" output should be lower - more Watts are being transformed into visible light, thus there is less energy radiated as IR ( or heat)

 

BUT,

 

The lower overall heat might be more concentrated in certain parts of the lamp resulting in the maximum temperature of certain components fof the Halogen bulb being higher than the maximum temperature of the incandescent bulb- which may be radiating its IR through a larger surface area, thus having a lower maximum "temperature"..

 

 

 

 

 

 


 
 
 
 




3284 posts

Uber Geek


  #1834408 31-Jul-2017 16:11
Send private message

@wellygary:

 

In totality the "heat" output should be lower - more Watts are being transformed into visible light, thus there is less energy radiated as IR ( or heat)

 

BUT,

 

The lower overall heat might be more concentrated in certain parts of the lamp resulting in the maximum temperature of certain components fof the Halogen bulb being higher than the maximum temperature of the incandescent bulb- which may be radiating its IR through a larger surface area, thus having a lower maximum "temperature"..

 

 

Right, that makes sense. Thanks.


23473 posts

Uber Geek

Trusted
Subscriber

  #1834485 31-Jul-2017 18:28
Send private message

halogen capsules are a lot smaller than the envelope of an incandesent lamp, so the glass will be much hotter. If you have the halogen inside a normal shaped incandesent lamps, they will be marginally cooler but not a whole lot in it.





Richard rich.ms

Filter this topic showing only the reply marked as answer Create new topic




News »

Pre-orders for Huawei MateBook 13 open now
Posted 14-Aug-2020 14:26


Freeview On Demand app launches on Sony Android TVs
Posted 6-Aug-2020 13:35


UFB hits more than one million connections
Posted 6-Aug-2020 09:42


D-Link A/NZ extends COVR Wi-Fi EasyMesh System series with new three-pack
Posted 4-Aug-2020 15:01


New Zealand software Rfider tracks coffee from Colombia all the way to New Zealand businesses
Posted 3-Aug-2020 10:35


Logitech G launches Pro X Wireless gaming headset
Posted 3-Aug-2020 10:21


Sony Alpha 7S III provides supreme imaging performance
Posted 3-Aug-2020 10:11


Sony introduces first CFexpress Type A memory card
Posted 3-Aug-2020 10:05


Marsello acquires Goody consolidating online and in-store marketing position
Posted 30-Jul-2020 16:26


Fonterra first major customer for Microsoft's New Zealand datacentre
Posted 30-Jul-2020 08:07


Everything we learnt at the IBM Cloud Forum 2020
Posted 29-Jul-2020 14:45


Dropbox launches native HelloSign workflow and data residency in Australia
Posted 29-Jul-2020 12:48


Spark launches 5G in Palmerston North
Posted 29-Jul-2020 09:50


Lenovo brings speed and smarter features to new 5G mobile gaming phone
Posted 28-Jul-2020 22:00


Withings raises $60 million to enable bridge between patients and healthcare
Posted 28-Jul-2020 21:51



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.


Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.