My skin complexion is darker and I want my skin tone to be lighter, how it is possible to get lighter skin

You said you have dark complexion. Dark complexion can not be made lighter unless it is tan. So if your skin is natural dark then it can be more glowing, not lighter. You should use natural remedies for glowing skin. Drink plenty of water, lemon and honey mix in lukewarm water. vitamin C is essential for glowing skin. Use antioxidant rich products in the morning and skin repair products in the night.