Simple circuit to cut down output from an AC Power Adapter

Job ID: 37510541

Budget: $14 – $30 NZD

I have an LED strip light that is DC3v, Wattage 5W/m (2m in total). I have found that 2.5v makes it glow the the desired brightness. I have a DC5.2v 800mA AC Adapter that I wanted to power it with. I need a circuit to cut the 5.2v down to 2.5v to power my LED strip light. Thanks.