too strong afterburner effect lights and reaching too far away
found those in particlesystem.ini (you might have to extract this file from FlightData.cat)
[EmitterType031]
Name=AfterburnerEmitter EmissionType=ORIENTED_EMITTER UpdateType=NON_MOVING MaxVisibleDistance=8000.000000 EmissionRate=0.001500 EmissionVolume=0.010000,0.010000,0.010000 EmissionVelocityTableType=CONSTANT EmissionVelocity=0.000000,-120.000000,0.000000 HasLightSource=TRUE LightColor=0.40,0.36,0.30 LightRange=5.0 LightSrcOffset=0.0,0.0,0.0 ParticleUpdateType=SIMPLE_POINT ParticleRenderType=SPRITE ParticleRandomOrientation=TRUE ParticleLifeTime=0.040000 ParticleLifeTimeDeviation=0.035000 ParticleWeight=0.00000 ParticleRandomness=0.010000 ParticleDragFactor=20.000000 ParticleInheritence=0.900000 ParticleColorTableType=TABLE ParticleColor[01].Time=0.000000 ParticleColor[01].Value=0.200000,0.200000,0.200000,0.020000 ParticleColor[02].Time=0.200000 ParticleColor[02].Value=0.150000,0.150000,0.150000,0.020000 ParticleColor[03].Time=0.700000 ParticleColor[03].Value=0.040000,0.040000,0.040000,0.012000 ParticleColor[04].Time=1.000000 ParticleColor[04].Value=0.000000,0.000000,0.000000,0.000000 ParticleSizeTableType=TABLE ParticleSize[01].Time=0.000000 ParticleSize[01].Value=0.450000 ParticleSize[02].Time=0.100000 ParticleSize[02].Value=0.520000 ParticleSize[03].Time=0.600000 ParticleSize[03].Value=0.500000 ParticleSize[04].Time=0.800000 ParticleSize[04].Value=0.350000 ParticleSize[05].Time=1.000000 ParticleSize[05].Value=0.000000 ParticleSizeDeviation=0.035000 TextureMaterial=AfterburnerMaterial [EmitterType032] Name=AfterburnerEmitter2 EmissionType=ORIENTED_EMITTER UpdateType=NON_MOVING MaxVisibleDistance=8000.000000 EmissionRate=0.001500 EmissionVolume=0.010000,0.010000,0.010000 EmissionVelocityTableType=CONSTANT EmissionVelocity=0.000000,-120.000000,0.000000 HasLightSource=TRUE LightColor=0.40,0.36,0.30 LightRange=5.0 LightSrcOffset=0.0,0.0,0.0 SubLightSourceX=TRUE SubLightSrcDist=0.5 ParticleUpdateType=SIMPLE_POINT ParticleRenderType=SPRITE ParticleRandomOrientation=TRUE ParticleLifeTime=0.040000 ParticleLifeTimeDeviation=0.035000 ParticleWeight=0.00000 ParticleRandomness=0.010000 ParticleDragFactor=20.000000 ParticleInheritence=0.900000 ParticleColorTableType=TABLE ParticleColor[01].Time=0.000000 ParticleColor[01].Value=0.200000,0.200000,0.200000,0.020000 ParticleColor[02].Time=0.200000 ParticleColor[02].Value=0.150000,0.150000,0.150000,0.020000 ParticleColor[03].Time=0.700000 ParticleColor[03].Value=0.040000,0.040000,0.040000,0.012000 ParticleColor[04].Time=1.000000 ParticleColor[04].Value=0.000000,0.000000,0.000000,0.000000 ParticleSizeTableType=TABLE ParticleSize[01].Time=0.000000 ParticleSize[01].Value=0.450000 ParticleSize[02].Time=0.100000 ParticleSize[02].Value=0.520000 ParticleSize[03].Time=0.600000 ParticleSize[03].Value=0.500000 ParticleSize[04].Time=0.800000 ParticleSize[04].Value=0.350000 ParticleSize[05].Time=1.000000 ParticleSize[05].Value=0.000000 ParticleSizeDeviation=0.035000 TextureMaterial=AfterburnerMaterial
the above are examples for stock afterburner effects, might be more in the particlesystem.ini file (AND some stock planes have custom effects in effect folder IIRC!)
many 3rd party aircraft have their own custom afterburner effects stored in mod installation\effects folder, but the same entries control the colour (intensity, RGB percentage values) and range (falloff, in meters) of the light attached to effect
Snailman is right, the landing light might be the cause too