KYIV, Jan 30 (Reuters) - Ukrainians were urged on Monday to swap old light bulbs for free energy-efficient LED bulbs under a scheme intended to ease an energy shortfall caused by Russian attacks. The goal is in the next few months to reduce by a quarter the energy deficit caused by Russian missile and drone strikes on power infrastructure that have frequently left millions of Ukrainians without light, water or heating. See here for a complete list of exchanges and delays