Can anyone explain the wattage on a halogen tube?

Hello…I’m new to this sort of lamp and I can’t figure out the wattage on the halogen tube packet.

I have uplighter floor lamps that use halogen tubes. For some reason, one of the lamps is much brighter than the others even with new bulbs. The rooms are really dark in the winter, so I wanted both of them to be at their brightest when they are lit (they are energy saving halogens.)

The halogen tube (which is a 240V, R7, 117m) packet states that it is “330W—->500W” (the arrow points to 500 W which is in much smaller type.) What is the wattage on this…..330W? or 500W? I’m confused.

Thanks in advance for your help.