What is the main conflict in Perfect Light by Ted Hughes?

Birthday Letters includes eighty-eight poems composed over a twenty-five- to thirty-year period, and traces the couple's brief but saturated life together, from the first date and marriage to separation and suicide. Some of the poems are thought to have been inspired by specific letters and photographs of Plath that Hughes rediscovered while preparing her papers for sale to Smith College. "Perfect Light" is one such poem.