In the figures , LED can reach 100lm / W luminosity , and take the new T5 fluorescent lamps is about slightly 90lm / W, LED can be regarded as today's most energy efficient light sources . But the LED efficiency will increase with the power down , 100ml / W only in the low-power , low- luminosity to achieve , if the power to elevate everyday lighting luminosity ( general indoor use about a dozen W to 40W), LED efficiency will lower than fluorescent lamps.

Of course, many pieces can be composed of a 15W to 20W LED components , LED scattered detachment suffered power , high efficiency make it to work in the state , but the cost would be prohibitively high , an LED than the price of the fluorescent several times higher , with more pieces of LED to replace a fluorescent lamp , then the price will be nearly 50 times more than the LED high ! So the real production of LED lights , its efficiency and luminosity to be comparable to fluorescent light , then the price will be generally unacceptable.

Taiwan's consumer rights organizations as the Republic of China Consumers' Foundation has been tested and found to Taiwanese market LED lights efficient than fluorescent and low energy saving bulbs , that commercial products , fluorescent and LED energy saving bulbs still better than power. In addition to efficiency and price, in addition , LED color rendering rate could be improved.

Nevertheless, the current LED has been used in road lighting and interior lighting.