You need to play iron banner. It's the easiest, fastest way to increase light. You can increase your light by 10-15 in one week. Increase rank with the vanguard, crucible, one of the factions, and the gun smith. All have a chance to drop gear at or above your average light level, when you get a rank up package. This gear will drop no higher than 5 light above your current average, so make sure your highest light gear is equipped before opening the package. It's slow, but reliable. Court of Oryx, for high light artifacts. Three of Coins. Exotics have a chance to drop above your average light. Raid. Challenge of Elders.