As a professional LED lighting manufacture, FOS has improve their website, it will be more better than former, Everyone could search lights from FOS's new website, we could compare the LED lightings to traditional lightings as well.

The LED light is more costly than the standard incandescent lights, but it lasts longer. Energy efficiency proponents are accustomed to comparing light sources on the basis of luminous efficacy. To compare LED sources to compact fluroscent lights,calculate lumens per wattage, divide lumens by current times voltage. For example, assume a device with typical flux of 45 lumens, operated at 350 mA and voltage of 3.42 V. The luminous efficacy of the LED source would be: 45 lumens/(.35 amps x 3.42 volts) = 38 lm/W To include typical driver losses, multiply this figure by 85%, resulting in 32 lm/W. Because LED light output is sensitive to temperature, some manufacturers recommend de-rating luminous flux by 10% to account for thermal effects. In this example, accounting for this thermal factor would result in a system efficacy of approximately 29 lm/W. However, actual thermal performance depends on heat sink and fixture design, so this is only a very rough approximation. Accurate measurement can only be accomplished at the luminaire level.

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