What is the buddhist conception of light? How do buddhists regard light? In their statues the eyes of Buddha are most times closed. Do they consider light a low worthy thing or something else. Newton showed gravity to be a powerful competitor of light. Hindi poetry considers the sun a selfish object despite the sun is supporting life. From this a doubt came to my mind that maybe buddhist regard light as a lowly?
Light has cleansing and illumination quality, Islam stress upon physical cleaning before praying. Does buddhism consider bodily cleansing a high virtue?
The Buddha was a psychologist rather than a physicist or house cleaner. The Buddha is called the 'Spiritual Doctor'. For the Buddha, the most important light was the 'light' of wisdom. 

Also, the Buddha mostly enjoyed living in the forest or jungle therefore was not overly concerned with keeping marble temples clean; similar to how Muḥammad (PBUH) formerly enjoyed meditating in a cave &amp; would wrap himself in blankets when giving a revelation. 

Therefore, the Buddha's eyes are closed so the mind can be understood internally, in particular, how the mind generates sufferings &amp; how the mind frees itself from suffering. 

That said, the Buddha was also a mystic and taught one meditation called the 'perception of light', which can be used to develop psychic powers. The Buddha had the 'Eye of God' (dibba-cakkhu) therefore could see, hear &amp; know what people were doing from within his mind. That is why his eyes are closed. The Buddha did not have to open his eyes to know what was going on the world. 


  And what is the development of mind using concentration that, when developed &amp;
  pursued, leads to the attainment of knowing &amp; seeing? There is the
  case where a monk attends to the perception of light and is resolved
  on the perception of daytime [at any hour of the day]. Day [for him]
  is the same as night, night is the same as day. By means of an
  awareness open &amp; unhampered, he develops a brightened mind. This is
  the development of mind using concentration that, when developed &amp; pursued, leads to the attainment of knowing &amp; seeing.
  
  Samadhi Sutta