decreasing screen brighttness less than the default limitation

[ipersian]

hi there,
i have used apps like screen adjuster which let us to decrease the brightness more than the default limit, but the wierd thing is that while on ics rom, you can not instal new apps until you turn these programs off, I noticed this issue on another program named filterscreen or sth like that, I have another question, does decreasing screen brightness more than the defualt limitation lead to a less battery consumption on amoled screens?

 

[Hawker]

Yes. The darker the screen, the less the battery drains