Although it depends on the light fixture, the general rule is that the more bulbs there are, the brighter the light fixture will be. For example, our Train Light Fixture (which takes two 60W bulbs for a total wattage of 120W) will be brighter than our Airplane Light Fixture (one 100W bulb)). However, factors such as the material and type of bulb must also be taken into consideration. We find that our brightest light fixtures are our Drum Lights and Chandeliers. For example, all of our Drum Lights can take up to three 60W bulbs but our customers often report that using one or two bulbs is more than enough.