“What is the equivalent LED lamps for xx watt filament lamps?”. “We replaced an energy-saving lamp by a LED down light with much less power consumption, but coming out that it looks much dimmer than before. Should we use a super high power LED instead?” these are questions that would be asked by customers mostly. In fact, this comparison criteria is inaccurate. We cannot judge the brightness of a LED lamp and a filament lamp just tough their power consumption. Traditional lamps like filament lamps and fluorescent lamps, they usually send out a full space light due to their internal constructions. In practical applications, no matter LED lights or traditional filament lamps, all of them will be used together with other reflecting tools, like projectors or other lamp covers with reflecting function. Lamp cover plays a role of light re-distribution. This re-distribution will be different according to different lamp covers used. For instance, straight tubular fluorescent lamp can be mounted either by lamp covers with reflection function or by lamp covers without reflection function. However, the lighting effects are totally different for them, as well as effective luminous flux. Thus, it is improper to compare LED lights and filament lights just though power consumption. To what subject you are comparing? Filament tubes without any other auxiliary components? Filament tubes only mounted by ballasts? Or filament tubes with full set of reflecting components including projectors? This kind of view makes no sense without any premises.
It is unreasonable to compare LED lights with traditional filament lamps just though power consumption. Traditional lighting sources have relatively stable technology, power consumption is basic a linear relations with luminous flux. Thus power consumption can present brightness to some degrees. While this linear relations cannot be established between LED lights’ power consumption and their luminous flux due to the unstable of the photosynthetic efficiency value of LEDs. Even for super high power LED, there is no such relation. With the rapid development of LED lighting technology, the improvement between the power consumption and the luminous flux will be continued. Thus it is impossible to give out a certain relations between them in near future. Maybe after several years, this problem can be solved. Then we can compare the brightness of LED lights and traditional lights by judging power consumptions.