strange light distribution

[gueoct]

i am simulating a light tube parallel to a wall.
The light tube has a black body emission in the emission slot.
for some reason the emission is hundreds of times stronger at the ends of the tube.
Does any one know why?

[glimpse]

it has something to do with polygon sizes..-I don't use mesh emitters so often (just on single poly planes, to mimic softboxes),
but I've noticed that if I scale them or tweak their size I have to tweak values too =)

[Goldisart]

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[gueoct]

it has something to do with polygon sizes..-I don't use mesh emitters so often (just on single poly planes, to mimic softboxes),
but I've noticed that if I scale them or tweak their size I have to tweak values too =)

i increased the number of height segments on that cylinder to have equal polygon size - without luck...

[Karba]

Set the same material id to every cylinder part.

[gueoct]

Set the same material id to every cylinder part.

Thanks! it works.
BUT: What does it mean?
i did a few tests:

?

:-/

??????????????