15 watt or 20 watt lamp in a standard bed side lamp. gave enough light to see what I was doing but not so much it woke DH or boy too much. Cheap, simple and didn't need any "new" kit. still have it as my bedside light now 2.5 years later. If you don;t find them at supermarket try a lighting specialist, not that uncommon tho.
I did try an 8w lamp but that wasn;t enough light to change a nappy by.