I'm not sure if this is the right place for this question but here we go.

I've built a web application which needs the screen to be on to be able to run the JavaScript functions it's built around - it's a location logger, if anyone's interested. As such, it chews through a mobile device's battery pretty quickly. I'm making a second version which does the same thing but I'm making lots of little changes to cut down battery consumption wherever I can: reduced overhead, less frequent network communication, vastly reduced interface, small things like that.

Now I've come across sources online which claim that having things like a dark wallpaper will reduce battery consumption because less light is used in the display. I'm not sure how credible these sources are (places like HowToGeek and AndroidPit) so any additional insight is welcome. My question is, if there is any truth to this, if I gave the interface a darker theme is this likely to help save battery consumption on mobile devices at all? Even if it's not a significant difference, I'm doing everything I can and investigating how much it can save by all adding up.

Thanks!