×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

The difference between 350 and 400 lux?

The difference between 350 and 400 lux?

The difference between 350 and 400 lux?

(OP)
Hi list,

Can a human eye distinguish between 350 and 400 lux lighting levels?

I can understand that between 0 and 50 lux, there is a big difference between illumination, but as you go higher in lighting level over an area, will a human eye notice that some areas are at 400 lux and other areas are at 500lux?

Is there a general rule to this, or some emperical data?

Regards,

Marko

RE: The difference between 350 and 400 lux?

Depending on how far apart they are.  If they're adjacent, then definitely yes.  There are various contrast vs illumination data floating around.  The Weber curve is one form.  

The eye has better than 2% absolute contrast resolution, over a fairly large range of backgrounds.

TTFN

RE: The difference between 350 and 400 lux?

The human eye typically requires a 3:1 difference to see a good "contrast" between differing luminance levels.  However, if you are illuminating an area to 350 lux for a task that requires 400 lux.  You may hinder productivity or accuracy.  

The human eye is very sensitive and adaptable to huge variances in light levels.  But, something is always easier to see with proper (usually higher) illumination levels and good uniformity.  Even if it is only 15%.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources