But at present, we are using a lot of bulbs and bulbs, when it expired, เป็นขยะ electronic containing heavy metal poisoning can be recycled, and if left to decay than landfill ใช้เวลาย่อย 500 years. So there is the environmental cost more than the cost of very active and is the problem that does not reduce the world's hot, if considering throughout the product life cycle, so the author has conducted the invention bulb from pencil because of pencils is graphite and to light up To use a pencil in the circuit to the light and can be used in everyday life, because ไส้ดินสอ that easily and can be used as well, not to take on the degradation of for a long time. The organizer had noticed, so the pencil was created.
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