A new and distinct cultivar of Begonia plant named `Betulia Light`, characterized by its upright and mounded plant habit; single to semi-double flowers that are white in color with pink centers and held above the foliage; and excellent postproduction longevity.

Um cultivar novo e distinto da planta do begonia nomeou o ` Betulia Light`, caracterizou-o por sua verticalidade e mounded o hábito de planta; escolha às flores semi-double que são brancas na cor com centros cor-de-rosa e prendida acima do foliage; e longevity excelente do postproduction.