It's just ambient lighting detail for the headlamps - there's really no functionality to them besides design.
Also it's more white on the X5 with Laserlight option - here's a couple shots of mine with low beams off and on.
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Current BMWs - '20 X5 xDrive40i M Sport, '20 BMW M550i | Past BMWs - '03 E39 540iT M Sport, '06 E53 4.8is, '11 E70 M Sport LCI
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