Argh! Forget about my previous post. Wha tyou can do is try not to click on the Collapse Transform switch. If that is not possible, then you can always copy the light layers in the precomp and paste it into the higher level composition.
Thereafter, you will want to switch the ‘original’ lights so that AE doesn’t calculate it twice.
HTH
RoRK
broadcastGEMs
customizable animated backdrops with Adobe After Effects project files