The Frandsen One with a rechargeable LED light source attaches to the luminaire with a magnet and works like a normal light bulb – except, of course, when it goes out for good, you don't have to replace it with a new one! Simply just remove the light source from the luminaire, charge it to full power and clip it back in place. The Frandsen One portable light source provides light for up to 12 hours on a single charge at its brightest intensity.