You need to be very careful with this activity and only do it when an adult is present. YOU MUST NOT TOUCH THE BULB WHEN IT IS ALIGHT.

Turn on a low wattage light, say a 25W light in a desklamp.

Very slowly and carefully move the back of your hand towards the lamp. You will soon feel the radiation heat.

Move your hand away and you will get less of the total radiation from the bulb and so it will feel cooler.