Anthem and Light.

Light is obviously significant in Anthem, in part because a light bulb is represented on the cover of the work. Rand obviously uses the light bulb, and electric light as a symbol in her novel. Light, in Anthem, can be representation of both truth and knowledge. There is a reason then, for a light bulb being placed on the cover, because the quest for knowledge and Equality 7-2521's acquisition of that knowledge is eventually attained by the end of the novel. The symbol of light is used throughout the book. Equality's first creation and his greatest achievement up to that point is the light he produces in secrecy. The moment of discover for him, is not only an influx of new knowledge, but also of truth. From this point Equality knows the truth of the oppressiveness in his society, and also the truth of self-discovery. The leaders of the society fear the light Equality has produced, because his discovery is one of individualism, and they fear letting others know of the truth.
Equality also changes Liberty 5-3000's name to The Golden One, in reference to how the light of the sun reflects off her golden blonde hair. This name is significant because she is not another one of Equality's "brothers." His feelings for her out measure the feelings he shares for anyone else in the society. The emotion he is feeling is love, and this love is new to him. In discovering the Golden One, Equality finds truth in his emotions, as well as truth in individuality.
When Equality and the Golden One finally find the abandoned house in the forbidden forest, Rand describes the house with much detail, making sure to mention how much light is let in by the expanse of windows. The house, filled with light, contrasts to the dark, candlelit city that Equality previously inhabited. The light of the house is significant because it represents the vast amount of knowledge that Equality will attain. Also the truth of Equality's individuality is discovered in the house, when he learns the word "I."