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Looking at this photo I can see lots of lights on the fuselage of this MD81. It can't be a reflection, can it?

enter image description here

Source: Airliners.net

Why are there so many lights?

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    $\begingroup$ For what I can see, the spot of light below the windows is a reflection of the wingtip light. $\endgroup$ Mar 10, 2016 at 2:04
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    $\begingroup$ Are the other lights simply interior lights visible through the windows perhaps? $\endgroup$ Mar 10, 2016 at 2:15
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    $\begingroup$ Does the smoke qualify for ground-ɕheɱtrᶏil? It's a trᶏil, and it's ɕheɱical... $\endgroup$
    – mins
    Mar 10, 2016 at 8:42
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    $\begingroup$ There are a couple of close votes on this: I'm voting to leave open as it does appear to be a fair question relating to "Are these lights part of the aircraft, or an optical illusion" which would seem to be on-topic to me? $\endgroup$
    – Jon Story
    Mar 10, 2016 at 15:12

3 Answers 3

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I think they are reflection from some light posts in the background environment (green line above the blue "horizon" light), and the reflection of the wingtip position light.

Reflection Comments

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    $\begingroup$ The one you circled in red is an actual light, to illuminate the wing leading edge. I think you are right about the rest though. $\endgroup$
    – fooot
    Mar 10, 2016 at 15:39
  • $\begingroup$ @fooot Interesting! Is that for in-flight inspection purposes, or? $\endgroup$
    – Sanchises
    Dec 22, 2017 at 10:59
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On the fuselage, only 3 per side (discounting the red anti-collision which is above/below):

  1. Ground flood aka runway turnoff lights.
  2. Leading edge for inspecting the wing and for higher visibility on ground to other vehicles.
  3. Nacelle.

enter image description here
(airliners.net)

And here they are from an MD-80 flight manual:

enter image description here

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I'd say they're reflections. You can see the reflection of a building or something like it on the fuselage, and if you look close enough, you can see the poles of the 2 first lights. Also most of them are at or near the windows' corners. There aren't any housings or mounts to lights on those spots.

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