The height at which they are placed is critical for floor lamps. Generally, the best size for a floor lamp is between 2 and 3 feet. This height gives the light an excellent distribution over a large area. If you have a vast room or space that you want to light up, you can go for a floor lamp taller than 3 feet. However, be aware that taller floor lamps can be challenging to move around and may take up too much space. So, if you are looking for a floor lamp that will be in use for long periods, go for one that is shorter than 3 feet.