Hi there! You can infuse your weapons and armor with higher light level (when applicable) with Upgrade Modules, which you can obtain by purchasing them from Banshee-44 in the Tower or by ranking up with the various playlist activities (Vanguard Strikes, the Crucible and Gambit). Please note that some weapons and armor cannot be upgraded. These are indicated by having the white corners with the imprint of their seasons. These are sunset pieces of equipment and they cannot be upgraded.