When can I reduce the LRV points to 20 rather than 30 on a staircase? Home › Forums › Quantum Flooring › When can I reduce the LRV points to 20 rather than 30 on a staircase? This topic has 0 replies, 1 voice, and was last updated 6 years ago by Tim. Viewing 1 post (of 1 total) Author Posts 25th March 2015 at 3:18 pm #167 TimKeymaster You can reduce the LRV if there is a very well lit (minimum 200 lux) stairway you maybe be able to use a stair nosing with only 20 points of difference. However, we would suggest to be safe you always aim to have 30 points of difference. Need help with colours? Use our LRV Colour Calculator Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In