Phoinix,
Those arn't lights - they are indicators for the engine bay fire suppression system - if they are red then the system has been expired - white means not. There is a system for each engine and if that does not work the system from another engine can be fed to the engine on fire for a second go!
I am an experienced Merlin chap so if you have any other question then asked away. Is your model going to have an working step which is just aft of the idicators?
844