To see light in your dream represents illumination, clarity, guidance, plain understanding,?and insight. Light is being shed on a once cloudy situation or problem. You have found the truth to a situation or an answer to a problem. Also consider the color of the light for additional significance.
If the light is particularly bright, then it indicates that you need to move toward a higher level of awareness and feeling. Bright light dreams are sometimes common for those who are near death.
To see soft or shadowy lighting in your dreams indicates feelings and thoughts from the primal aspects and less developed parts of your subconscious.
To dream that you cannot turn on the light indicates a lack of insight and perspective on a situation.
About the other part i do not know anything special.