After import 3dsmax scene to unreal the sun light become dark and all lights values need to be increased like 1000 lux for the sun light and the scene bcome dark after building light . please help me

Development Rendering
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Maybe the tutorials you were watching the intensity was in unitless and not in lux or cd?

What the Heck is Lux?
Illuminance Example
300 - 500 lux Sunrise or sunset on a clear day. Well-lit office area.
1,000 lux Overcast day; typical TV studio lighting
10,000 - 25,000 lux Full daylight (not direct sun)
32,000 - 130,000 lux Direct sunlight