>> http://www.omafra.gov.on.ca/english/livestock/dairy/facts/info_nutsbolts.htm
>>
>> Incandescent        15- 20
>> Halogen              18 - 25
>> Fluorescent         80 - 100
>> CFL                     50 - 80
>> Mercury vapour   40 - 50
>> Metal Halide         80 - 90
>> High Pressure Sodium 90 - 110

Low Pressure Sodium is higher again.
And a lovely orangey colour as a bonus :-)

We have just had 100 att CFLs introduced to our market. About the same 
$/Watt as the <= 23 Watt ones avaiable for now. Utterly marvellous. 
Claim 500 Watt tungsten equivalent. They may not be quite that but 
they are BRIGHT and lovely daylight blue. I bought several and am also 
trying them as photographic lighting. Not ideal but useful.



        Russell

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