The washers are a fairly good idea, but be warned, when you 'skoosh' them, they go feking everywhere, all over the bonnet, wing mirrors, windscreen...... but the lights come up a real treat 
i presume the light washers use the same liquid as the windscreen washers? assuming the water is mixed in with the potentially corrosive anti-freeze stuff, you don't really want to be spraying it too often and dissolve the beautiful paintjob like acid rain
plus i assume you can only realistically spray it whilst driving 100mph, cos if you do it at standstill, the spray will just dribble over the lights and there is no movement of air to push it away?
i'm just rambling now - it looks very nice, i hope you enjoy the machine