Its designers Ross Zhuravskiy said, as long as used properly, the small flashlight can “permanent” lighting.
The flashlight will shine without power supply when it inducts to temperature difference
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Small flashlight with TEG (thermoelectric generator), to generate an electric current
Lumen with a thermoelectric generator, a ceramic stick, when it detects temperature difference it will generate an electric current.
Its working principle is very simple, when you touch TEG with finger, it is forming temperature difference on both ends, so as to generate an electric current to light a flashlight bulb. Designer Ross Zhuravskiy said, the human body temperature is about 98 ° F (Fahrenheit), ambient temperature of about 82 ° F, the temperature difference can cause Lumen current about 15 mA, 3 v, is enough to light up Lumen built-in a 5 mm size of Cree LED lamp bead, light output up to 3000 mCd.
When the temperature difference is bigger, excess energy will be stored.
Lumen of the shell has two kinds of optional materials, one is a kind of aluminum, the other is a kind of titanium, weighs about 35 grams and 45 grams respectively. In addition to different materials, Lumen is divided into ordinary and premium, premium inside a tube of tritium gas, can persist for more than a decade, so, even in the dark room, you can also use tritium luminescence to find the “little guy” easily.
Lumen Equipped with tritium airway in the dark room
At present, the Lumen in the raised platform on Kickstarter has gained the support of more than $120000, and the number is growing. According to Kickstarter page, the sponsors will send out products to supporters in succession in February 2016.