Question

Switch off the lights when outside is bright I want this drawing

Answer 1

You can find the drawing relating to it in the attachments. It;s a very interesting topic to show in exhibition which in turn help in spreading the awareness about energy consumption in general public and this will also motivate them to make the efficient use of electricity through out the country. This will result in handling the increasing demand of energy through out the country. 
Also, you can get ideas from these attachment to make a good one yourself.

Answer 2

"Save Energy For The Future Generation"

By turning off the lights when it is bright outside we can save energy.

Conserve the energy.

Please refer to the attachment of drawing which depicts the above caption