The LED.white is a superb alternative to the traditional ray box. It can be used in most experiments in place of a ray box and offers a number of advantages:Purer white light compared to the traditional ray optics boxes no blackout requiredNo additional Power Supply required - 5V plug top is includedUses less power - 1W LED rather than 24/36W bulb and is much cooler than traditional ray optics boxesMuch longer life than filament bulbs - approx. 10 000 hoursPlug top PSU prevents the voltage from being suddenly increased causing the bulb to blow as it can be with a traditional ray box and variable power supply set upCan be mounted on a retort stand using the incorporated bossHas an integral Slit Plate HolderSpectra produced using prisms or diffraction gratings are bright and clear from red through to violet. It can be mounted on a retort stand or optics bench using the mounting rod.The product includes:LED.white unit with power supplyAn experiment guide on CD2 slit plates and holderMounting rodAn LED.white Experiment Kit (B8L87359) a Light Guide Demonstrator (B8A45688) and an Acrylic Light Pipe (B8R08096) are also available separately.