On Feb 1, 2012, at 4:07 AM, RussellMc wrote:

> impact of converting from incandescent bulbs to CFL bulbs in Canada.

Ouch.  "Whether CFLs reduce greenhouse emissions is highly local and depend=
s on how your power is generated as well as whether the desired internal te=
mperature is cooler or warmer than the external temperature, and for how lo=
ng each year."

The basic premise would hold true for any illumination technology.  Essenti=
ally "lighting efficiency can be irrelevant to greenhouse emissions."  Whic=
h makes sense, since HVAC tends to dwarf lighting when it comes to energy u=
se...

Interestingly, they rate the fabrication cost (in energy) of CFLs and Incan=
descents as essentially equal (referencing some other document.)

BillW

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