brighter lights at high rpm?

Every time i drive the car up to or over 5,000 rpm all my lights on the outside and inside get brighter. Can anyone help explain why this happens?

Voltage regulator in the alt. or possibly bad brushes in the alt., have a proper load check done on the charging system, most batt./alt. shops will do this for free, it only takes a few min. 94

Ide do that pretty soon to, you rev to high and you might start blowing fuses and posibly melting wires or causing shorts.