If you wanted to use one of my favorite lights, the Fluval Marine Nano, you could probably get away with mounting it inside the lid. Or could cute a whole in the lid large enough for the LEDs but smaller than the housing and rest the light on the lid (I would use spacers/bumpers). I use little clear rubber pads from the hardware store (think meant for furniture) and use them to lift the lights off my lids and to keep them from slipping.
Or just ditch the lid and use whatever mount fits your new light
Or just ditch the lid and use whatever mount fits your new light