I'm trying figuring out how to put every other with a brigther fill color for the same serie.
Please have a look at my reference, this is what I want to accomplish.
http://imgur.com/sYW8guR
FYI: Heres a simple area chart to save you time
http://jsfiddle.net/kylander/33cutjqn/
I don't see a way to do this without either using multiple series, or writing your own complex rendering script.
Another alternative for using 2 series that works a little different than the one proposed by Sebastian:
1) User the alternateGridColor
2) set the fillColor of your series with an appropriate opacity for the alternate grid color to have the desired effect
3) use a 2nd series, which can be automatically created, to stack on top of the main data series, filled with white to cover the alternating color in the 'open' space.
Example
:
Honestly, I would personally simply opt to use the alternateGridColor option as is, however.