"But soft, what light through yonder window breaks?" 2.2.2
"It is the East and Juliet is the sun." 2.2.3
Capulet's Orchard (Light/Darkness)
"Arise fair sun, and kill the envious moon." 2.2.4
Romeo notices a light coming from a distance. The light is the sun, and Juliet is protrayed by the sun. This light can brighten Romeo in the darkness.
"I would not for the world they saw thee here." 2.2.79
Shakespeare uses to describe Juliet by comparing her to the sun. This relates to the theme of light can overpower darkness. Romeo is saying how "Juliet is the sun", making him say how she is the brightness in his life.
Romeo and Juliet
"I have night's cloak to hide me from their sight; And but thou love me, let them find me here." 2.2.80-81
In this, Romeo still says how Juliet is like the sun, but now he compares her to the moon; his old lover Rosaline. Rosaline is like the darkness, and Romeo thinks how Juliet is far more beautiful than her. Shakespeare makes it so that Romeo is now fully in love with Juliet, not Rosaline.
Meeting each other at Capulet's Garden (Light/Darkness)
"My life were better ended by their hate, Than death prorogued, wanting of thy love." 2.2.82-83
Romeo and Juliet are talking with each other in this scene. Juliet says how she wouldn't let the guards see him for the whole world. This relates to the theme because Juliet is the light, protecting Romeo at all costs.
Although darkness can mean evil, it can mean good things as well because Romeo is using it to hide from the guards. This makes him able to stay with Juliet. Shakespeare creates a different perspective of the word darkness by using it for the better.
Shakespeare uses some foreshadowing here about death, because Romeo says how he would rather die than not be with Juliet. This shows Romeo's love for her. This also could connect to darkness because death is like darkness.