Thank you for viewing. I don't know anything about light bulbs, so please judge from the photos. I probably threw away the burnt-out bulbs during a decluttering session, so I don't know the size. I wanted to put this in a certain place, but it was too big and I couldn't. Most of the light bulbs in my house are the type that are inserted horizontally or diagonally, but I want to talk to the designer for an hour about why it can't be done just from directly above. I forgot to ask the electrician who came to see the distribution board. I hope the number of LED bulb sets doesn't increase. *Please refrain from purchasing if you are looking for new or perfect items.