The Blood Lamp only works once, and you need to add of a drop of your blood to activate it! The idea is to stop and think about how badly you need light before you use it. Designer Mike Thompson created the lamp in order to draw attention to how much energy we waste. http://www.miket.co.uk/blood_lamp.html -via Dark Roasted Blend
If it was multi-use, however, it would be loved by goths. Vampire light!