Today, let's take a look at what indicators should be used to measure the economy of LED lamps.
When it comes to LED, energy saving must be a word that everyone thinks. Then I immediately thought of expensive, the price is high.
So, what indicators should be used to measure the economy of LED? 1. Yuan/Watt how much is one watt? I'm afraid this is a lot of inquiry questions?
Toosimple, toonaive, too amateur!
From a Logical Point of View: as a customer, do you buy a lamp to buy its wattage?
As a designer, do you do lighting design or electricity consumption design?
As a manufacturer, oh, yes, you are the initiator. After selling lights, you will fight for the price. In order to highlight your outstanding ability in this respect, congratulations, successfully dropped the price measure to the wattage.
If you look at the essence of the phenomenon, the implicit premise of this statement is that the lighting effects of the products made by everyone are the same.
This misunderstanding obviously comes from the constant indoctrination and brainwashing of the idea of LED energy saving, which has changed everyone's cognition. By default, all LEDs are the same energy saving, and then the economy of lamps is evaluated at the level of technical energy saving.
However, in specific applications, it is a false proposition that a certain technology is more energy-saving.
In fact, the same technology, different products, there is nothing in the sky?
The luminous efficiency of a single chip is as small as dozens and as large as hundreds.
In addition, the package, the design of the lamps, and the energy efficiency of the lamps that came out later are really worse than the sea.
Take A chestnut casually: 'diaosi and Gao fushuai', A 60lm/W 40W lamp panel A and A 130lm/W 40W lamp panel B, if the price is respectively 800 yuan (20 yuan/W)And 1600 yuan (40 yuan/W)
, If measured by how much money per watt, Gao fushuai B is twice as high as diaosi A.
However, if we calculate according to the luminous flux obtained, Gao fushuai B is 1600 yuan/5200lm = 308 yuan/klm, and diaosi A is 333 yuan/klm. (Please don't think about finding a boyfriend)
In this case, regardless of other aspects, if we buy lamps to buy the quantity of light (Luminous flux)If so, obviously choose Gao fushuai's B (40 yuan/W)More cost-effective.
So, should we use yuan/klm to measure the economy of an LED lamp?
2. Yuan/klm using this index is already relatively professional, considering the economic evaluation of LED lamps at the lamp level.
However, this method still has its defects, or the chestnut just now: 'the reverse attack of diaosi', assuming that the required surface is 2m square.
All the Light of diaosi A shines on the illuminated surface to obtain 500lx illuminance;
Gao fushuai B is more interesting and not so focused. Only 1/3 of the light reaches the front and gets 300lx illuminance. (Don't associate)
At this time, it can be obtained that in this application condition, if the relationship between price and illuminance is considered, diaosi A is 800 yuan 500lx = 160 yuan/100lx, gao fushuai B is 1600 yuan 300lx = 533 yuan/100lx. Diaosi's counterattack succeeded!
Therefore, it is not necessarily happy to marry Gao fushuai, but also depends on whether he cares about you.
3. Yuan/㎡/100lx obviously, when buying lamps, the luminous flux is not enough. It is necessary to buy useful luminous flux, which can usually be measured by illuminance.
We might as well call this economic evaluation index yuan/㎡/100lx as cost index.
This is an index to consider the economy of lamps from the design level, which is suitable for specific lighting design projects.
Whether the luminous flux of the bought lamp is useful depends on itself: light distribution, and on the designer's design: whether it is properly used in the right place.
Return to the power density method to estimate the budget, and change the power density in the above table into A representation method, with diaosi A: 10 W/㎡ 500lx = 2 W/㎡/100lx, Gao fushuai: 10 W/㎡ 300lx = 3. 3 W/㎡/100lx.
Then, combining price and power, diaosi A's cost index is 800 yuan 40W2W/㎡/100lx = 40 yuan/㎡/100lx, while Gao fushuai B's cost index is 1600 yuan 40W3.
3 W/㎡/100lx = 132 yuan/㎡/100lx.
As we said, each lamp has an index in functional application sites, and there is also a corresponding cost index!
As long as there is the price, Power and Light distribution data of lamps (Power density can be calculated).
According to the cost index of lamps, we can get the lamp cost of the project and compare which lamp is more economical.
We might as well call this kind of lamp cost estimation and economic evaluation method as the lamp cost method.
How to use the lighting cost method to estimate the project cost?
Try one chestnut: Suppose there is an office space of 6000 ㎡, and the illuminance needs to reach 500lx.
When the space height is 3 m, the index of diaosi A is 40 yuan/㎡/100lx, and the index of Gao fushuai B is 132 yuan/㎡/100lx.
When using diaosi A, the project will cost 40 yuan/㎡/100lx6000 ㎡ 500lx = 1. 2 million;
When using Gao fushuai B, the project will cost 132 yuan/㎡/100lx6000 ㎡ 500lx = 3. 96 million.
Of course, all the figures are just examples, and the gap caused by the actual situation should not be so large.
For owners and designers, when you compare the economy of the Two Lamps in places that need uniform lighting, you may as well use the lamp cost method.
For manufacturers, when owners pay attention to economy without considering factors such as lighting quality, your products are really good, but when the price is relatively high, you may as well change your thinking and find out the index and cost index of lamps, using the lighting cost method to compare and analyze may be able to pull back a city.