Question: if I change my primary weapon from the messenger (with 170 attack) to hard light (with 160 attack) and my light level decreases from 170 to 168, am I technically weaker in terms of defence now solely due to the primary weapon change? I don't really get this whole defence level, total level, attack level, light level thing going on in destiny atm.
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Yes, you're weaker. Your light determines your overall strength and defense as it's an average of all your weapons, armor, class item & ghost.