Slightly off the topic but since iOS 6 or perhaps even 5 screen curtain now 
turns off backlighting so will save battery on your iDevices  with out having 
to set brightness right down. At least that was mentioned in a couple of 
podcasts I herd. 

Danny. 
 

Sent from my iPhone

On 02/04/2013, at 4:19 AM, Chris Blouch <[email protected]> wrote:

> While screen curtain will black out the screen, it does not turn off the 
> backlighting so doing F1 a bunch of times will still save a bunch of battery 
> life. I do wonder if screen curtain saves power from not running the Graphics 
> Processing Unit (GPU) since nothing is being put on the screen? Might be some 
> help but turning of the backlight will help a lot.
> 
> CB
> 
> On 4/1/13 7:13 AM, Chris H wrote:
>> Turn screen curtain on with ctrl-option-shift-f11.
>> 
>> 
>> Christopher Hallsworth
>> E-mail and Facebook:
>> [email protected]
>> Skype:
>> chrishallsworth7266
>> Twitter:
>> http://www.twitter.com/@christopherh40
>> Find my blog at
>> challsworth2.wordpress.com
>> 
>> On 01/04/2013 05:10, anita wrote:
>>> Hi List,
>>> Besides dimming my screen, is there anything else I can do to retain better 
>>> battery life on my MacBook Pro, and if so how?
>>> Anita
>>> 
>> 
> 
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