The allLightInt mel script creates a node that multiplies the intensity of the lights you have selected.

Usage: Source the script, select your lights, and execute it.

A null node is created "baseLightInt_int". Select this node, open the extra attributes tab, and modify the value.

You'll see your light's intensities changing according the value you set to the multiplier.

The 2 delete extra attributes are the cleanest way to remove the nodes created by the script.

- delete_wOldValues attribute will remove the nodes and will restore the old values you set to the light's intensities (before you execute first this script)
- delete_wNewValues will also remove the nodes BUT will keep the values like set with the multiplier node.

You can create as many groups as you want.

Limitations:

I've been a bit lazy with this one. You'd better choose light nodes instead of something else...

That's it folks, have fun with it... ;-)

get the allLightsInt mel script