glare

hard shadows

monotony

glare and hard shadows

surface area

space height ratio

illumination

coefficient of utilisation

object should be viewed from a distance

object should be move constantly

object should be viewed from a close vicinity

viewer should move constantly

ageing of the lamps

type of work carried out at the premises

lamp cleaning schedule

all of the above

size of the room

space height ratio of the lamps

colour of walls/ceiling

all of the above