Of course it is. The light is shrouded in lies that one tells oneself.
Hatred. Anger. Vengeance. Those are the realities of life. To deny them, to give in to the facade of 'order' or 'tranquility'... it's the greatest lie of all. And living that lie does nothing but dampen and supress one's powers. While I am no longer a disciple of the Sith, their code, written by Darth Bane, still rings true:
"Nwûl tash. Dzwol shâsotkun. Shâsotjontû châtsatul nu tyûk. Tyûkjontû châtsatul nu midwan. Midwanjontû châtsatul nu asha. Ashajontû kotswinot itsu nuyak. Wonoksh Qyâsik nun."
Translated to a tongue you would understand, that becomes:
"Peace is a lie, there is only passion. Through passion, I gain strength. Through strength, I gain power. Through power, I gain victory. Through victory, my chains are broken. The Force shall free me."