The difference between the three lights and four lights of the bath bomb

Shower heater four lamps warm, because four lamps than three lamps more than one lamp, so that in the full open state of the shower heater is sure that the four lamps warm, but four lamps than three lamps of the shower heater electricity, so the installation of the shower heater to look at the indoor area and then choose to install, if the indoor area of six square feet or so, three lamps of the shower heater is enough, if more than six square feet should be installed with four lamps.