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The required effects is that of a changing color light bulb. It would preferably be an emission mesh.

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You can do this by giving your object a material, and in that material, using a Value Node with #frame as a value, connected to the hue modulation of a Hue/Saturation/Value Node.

When you enter #frame into the value node, it will change color and change to 1.0 - this is normal, it will change along with your frame when you animate. I find the default rate of change too fast, so I usually multiply it by some low value to slow it down. When you connect it to the HSV Node, you must also input SOME color (default white will not work). I used an RGB Input node so I can easily change the "base color". Connect this to an emission shader, and then to the material output. When you press "play" the color will change with the frame number.

Value

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got to the materials , and right click on the base color and click insert Key frame , and then move some key frames forward , then again add a key frame on the base color

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