Comparing incandescent lamps and LED lamps
The hypothesis that the LED lamp would require less power to produce the same brightness as an incandescent lamp has been proven to be true.
LED lamps consume less power compared to an incandescent lamp in order to provide the same level of brightness. They also become less hot on the surface and have a longer lifespan. An incandescent lamp can last an average of 1,500 hours of running time compared to an LED lamp which can last up to 60,000 hours. However, the price of LED bulb is still many times higher than the incandescent bulb, although with time, the gap in price may narrow.
Try to repeat the science fair project by comparing a florescent light with LED lamps.
The experiment can also be repeated by comparing the brightness of the LED lamp and incandescent lamp at different distances from the light source.
Incandescent light bulb - http://en.wikipedia.org/wiki/Incandescent_light_bulb
LED lamp - http://en.wikipedia.org/wiki/LED_lamp
LED lights vs incandescents - http://www.ehow.com/about_5447908_led-lights-vs-incandescents.html
Risk of electrocution or burns. Be extremely careful when handling electrical equipment and electrical power supplies. This experiment requires adult supervision.