With the Light Bulb ability, Kirby can walk around and jump as he normally could (but he cannot fly), and he can destroy enemies that come on contact with him or the debris from his explosion. It is very similar to the Exploding Snowman ability.
Kirby becomes a light bulb on legs and can walk freely. This works like the Light ability, until Kirby explodes, damaging all near.
Kirby turns into a walking light bulb that can explode.”
— Description • Official Strategy guide
Kirby becomes a small light bulb, burning brightly. Eventually, he burns too brightly and explodes, destroying nearby enemies.”