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The length of concentration focus to the cascaded thermoelectric generator (TEG) module determines the power of the output along the entire surface of the heated side receiving the thermal radiation. LED-type ( Lighting Emitting Diode ) bulb with low power 10, 15, and 20 Watt shown that the emitted lights also contain the thermal that can generate electricity on the TEG. The experiment results show that the 20 Watt lamp with a concentration focus of 110 mm has the highest power and efficiency (2.5%), while the efficiency of 15 and 10 Watt bulbs is 1.2 and 1.6%, respectively. The significant amount of bulb power used by consumers today has the potential to be the source of new and renewable energy to produce electricity. Although the amount of power still small, it can be used to charge mobile phones and power banks.

Experimental study of cascaded thermoelectric generators with differences in focal length using LED lights energy radiation