According to my knowledge, most developpers use a file call light.bin or headlight.bin (in the light folder) to create 60 to 100 m light with 10 to 40 open angle. They stack the same light several time, each one more forward to create long distance light. It's the case for RWA 1116 and 1216 (and most vR engine).
Key values on light cone configuration are :
<Radius d:type="sFloat32" d:alt_encoding="0000000000005940" d:precision="string">100</Radius> : light lenght
<Phi d:type="sFloat32" d:alt_encoding="0000000000002440" d:precision="string">10</Phi> : light large angle
<Theta d:type="sFloat32" d:alt_encoding="0000000000001440" d:precision="string">5</Theta> : light core anlge (muste be lower than Phi)
Key values for colors :
<Red d:type="sFloat32" d:alt_encoding="0000000066A0E93F" d:precision="string">0.80083</Red>
<Green d:type="sFloat32" d:alt_encoding="0000002074B4E93F" d:precision="string">0.803278</Green>
<Blue d:type="sFloat32" d:alt_encoding="0000000013B2E93F" d:precision="string">0.802988</Blue>
<Alpha d:type="sFloat32" d:alt_encoding="000000000000F03F" d:precision="string">1</Alpha>
Just RGB coding, Alpha is useless.
If you set Radius to 10 (or lower), Phi to 10, Theta to 5, light are not intrusive. But do not expect them to cut the dark night.