Question

where are the day blooming flowers usually bright

Answer 1

They receive sunlight.That's why.
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Answer 2

Color, smell, shape and overall appearance of any flower is developed for soul purpose of pollination. Whether pollinating agent is wind, insect or anything else, the flower must facilitate the pollinator. Petals play key role in luring the moths, bees, butterflies etc.

Day time flowering plants with colorful petals usually attract butterflies & other insects that are active during day time.

Night flowering plants usually attract moths & other nocturnal pollinators.

It makes sense why night blooming flowers are white, and mostly fragrant as well, because colorful pigments have no purpose to play at night. White flowers also reflect moonlight. Night blooming white flowers avoid the competition of pollinators with day blooming colorful flowers all together. It's nature's win-win situation for plants as well as pollinating creatures.