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The main difference between a 100-watt and a 75-watt light bulb is the amount of light output they produce. A 100-watt bulb will be brighter and consume more energy compared to a 75-watt bulb. The 100-watt bulb may also generate more heat than the 75-watt bulb.
The 100W light bulb is brighter than the 60W light bulb. The difference in brightness is 40 watts.
A 60 watt light bulb is a light bulb with 60 watts capacity. When talking about watts, you're talking about the power that is transferred from the appliance to the accessories. Therefore, the light bulb labeled "60 watts" takes 60 watts to light up. A 60 watt light bulb will not be as bright as a 120 watt light bulb.
A light bulb typically generates a small amount of heat, but it is usually negligible in terms of changing the overall temperature of a room. The impact it has on room temperature will depend on factors such as the wattage of the bulb and the size of the room.
Thomas Edison's first practical incandescent light bulb had a power consumption of around 60 watts.
A light bulb with a power consumption of 150 watts typically produces around 2600 to 3000 lumens.