Walk your factory floor and you see it: pools of bright light, then patches of shadow,
especially between machines and at the edges. It feels minor — but uneven lighting is a genuine
safety hazard, a cause of mistakes and rejects, and a sign your lighting was never properly
designed. Here is what causes it and how it is fixed.
The Technical Name: Poor Uniformity
Lighting designers measure not just how bright a space is, but how even the
light is — called uniformity. A floor can have a great average lux number and
still be dangerous if that light is concentrated in spots with dark gaps between. Uniformity,
not just brightness, is what makes a floor feel properly lit.
Why Dark Spots Form
| Cause | What Is Happening |
|---|---|
| Fixtures spaced too far apart | Light pools don’t overlap, leaving gaps |
| Wrong beam angle | Beams too narrow for the mounting height |
| Machines blocking light | Tall equipment casts shadows |
| Failed or dimming fixtures | Dead or aged lights leave holes |
| Wrong mounting height | Too high or low for the fixture |
Why It Is Dangerous
- Safety: shadows hide hazards, trip points, moving machinery and
forklifts — a leading cause of workplace accidents - Quality: workers cannot inspect properly in shadow, so defects slip
through - Fatigue: eyes constantly readjusting between bright and dark tire fast
- Security: dark corners are blind spots for cameras and supervision
How It Is Fixed
The fix is proper lighting design, not random extra fittings. It means spacing fixtures so
their light pools overlap (a common guide is 1 to 1.5 times the mounting
height apart), choosing the right beam angle for the ceiling height, adding light where machines
cast shadows, and replacing aged fixtures. A supplier should give you a uniformity
simulation showing light across the whole floor before you buy — the right way to
guarantee the result.
Frequently Asked Questions
What causes dark spots on a factory floor?
Usually fixtures spaced too far apart, the wrong beam angle, machines casting shadows, aged
or failed fittings, or wrong mounting height — all problems of uniformity.
Why is uneven lighting dangerous?
Shadows hide hazards and moving equipment, cause quality defects, tire the eyes, and create
security blind spots.
How do I fix uneven factory lighting?
Through proper design — overlapping light pools, correct beam angles and mounting heights,
and a uniformity simulation before purchase.
Is more light the answer to dark spots?
Not necessarily — correct placement and beam angles usually matter more than simply adding
fittings.
Reway eliminates factory dark spots with properly designed ULTRABAY and PROSAFE high bay layouts and a free
uniformity design. Get an even lighting layout →
