In Chinese culture, as in many others, the morning symbolizes new beginnings, vitality (朝气 - zhāoqì), and hope. 晨光 is the physical manifestation of this new start. It's the light that chases away the darkness, both literally and metaphorically. This makes it a powerful and frequently used symbol in literature and art to represent the start of a new chapter or the emergence of hope after a period of difficulty.
Comparison to Western Concepts: In English, “dawn” or “daybreak” are close translations. However, 晨光 focuses more on the quality of the *light* itself rather than just the time period. While you can “arrive at dawn,” you “bathe in the 晨光.” It's more visual and sensory. It's softer and more poetic than the more general term “sunlight,” which can be harsh and direct.
A Modern Icon: A hugely significant modern cultural reference is the stationery brand M&G 晨光. It is one of the largest and most ubiquitous stationery manufacturers in China. Nearly every student in China has used M&G 晨光 pens, notebooks, and other supplies. The brand name brilliantly co-opts the positive, hopeful, and youth-oriented connotations of the word, associating their products with the start of a new day of learning.