Traditional incandescent light bulbs measured their brightness in watts; if you wanted a brighter bulb, you bought a higher wattage.
With LEDs we use lumens, this is a measure of the total amount of visible light to the human eye from the light bulb. So, the higher the lumens, the brighter the light bulb.

The table below is to help show the equivalent of an incandescent to a LED light bulb:

CFL and halogen bulbs

Other replacement light bulb choices consume more power than LED bulbs and have shorter lifespan, but cost less to buy.