Turok,
I recall reading that post and thinking what a load of rubbish. The issue of ventilation is obviously related to heat generated by a bulb. Anybody should be able to work out that if CFL uses about 20% of the power of a conventional bulb for the about the same luminance, then at least 80% of the power of a conventional bulb is going somewhere other than into visible light. That somewhere is of course heat.
The emission spectrum of an incandescent bulb will be similar to a black body - hence lots of heat at the temperatures that are achieved in the filament.
I recall reading that post and thinking what a load of rubbish. The issue of ventilation is obviously related to heat generated by a bulb. Anybody should be able to work out that if CFL uses about 20% of the power of a conventional bulb for the about the same luminance, then at least 80% of the power of a conventional bulb is going somewhere other than into visible light. That somewhere is of course heat.
The emission spectrum of an incandescent bulb will be similar to a black body - hence lots of heat at the temperatures that are achieved in the filament.
Quote from Turok:
Posted by Bitstream:
CHRISTOPHER BOOKER
UK Daily Mail
Tuesday, March 13, 2007
**Big Snip**
>More seriously, because CFLs need much more ventilation
>than a standard bulb, they cannot be used in any enclosed
>light fitting which is not open at both bottom and top -
>the implications of which for homeowners are horrendous.
A: I'm not taking a position here on GW or the impact of various light bulbs, just reading and observing.
B: There is an incredible amount of spin and outright BS in the article that Bitstream posted -- for an example and due to lack of time, I'll just pick one point and respond.
I am a developer/homebuilder in SoCal. We are required by California Title 24 (energy bill) to include a minimum percentage of "High Efficacy" lighting in our new homes. This pretty much means CFs at this point.
The above posted snippet is so wrong it's laughable (and remember, I install them in every house I build and have to have them inspected by a certified inspector).
CF's don't require more ventilation, they require less. I install 17 of them per house and not a single fixture is vented on the top (in fact, Title 24 FORBIDS venting in this way and requires us to use AIRTIGHT and INSULATED fixtures on the topside. Also we install completely sealed fixtures in our bathrooms top AND bottom per manufacturer recomendations.
Anyone can write BS on the internet. Go to Home Depot or Lowes and look at the Halo cans (or go to manufactures website or the Cal Title 24 website) and see for yourself.
(we use a Halo #H272ICAT in case anyone wants to confirm my facts.)
JB