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high-brightness led grow-light

by:Mingfa Tech     2020-01-02
Note: This project page has become a design discussion. (
We still welcome constructive suggestions and cooperation.
See the notes section at the end. )
* No recommended buildings-plans here.
** Instead, I recommend shopping on standard white LED lights --Bulbs.
Please try to use them as you grow
Let\'s all know what it is.
My calculations show that they should be economical, energy efficient and great for plants.
After several hours of research, I came to the conclusion that it makes no sense to build DIY growth --
I can\'t recommend it to anyone honestly.
Part of the reason is technical difficulties.
Make it easier and make it more expensive), but more-
It is important that the price of the final commercial product is much cheaper and the quality is much higher.
You better buy one off-the-shelf product.
Surprisingly, I don\'t even recommend buying \"LED Grow Lights\" in red and blue, as the best option seems to be the traditional white LED lights! Sure, grow-
The energy of the lamp has increased by about 25%.
However, for growing plants, they cost 2 to 8 times the price per unit of electricity.
LED lights $4 per watt
Usually electric or close to $2/W
If it\'s made in China
The retail price of the white LED bulb is $1 and sometimes $0.
50/W if GreenInstant subsidyrebate.
More green from white LEDs
Than the typical \"growth-
Unfortunately, the plants do not use the lights very effectively;
However, low-efficiency Green-pay for electricity bills-
In fact, the cost of light is lower than the purchase of planting --
No green light. light!
Even assuming you have the Sky
The maximum electricity bill is $0.
50/kWh, zero
Financing percentage when I try to amortize the cost of growth-
Light, I think the led will burn
Before accumulating enough power savings to make up for their high power,front cost.
So what kind of light do plants need? What is best?
So the main driving force of photosynthesis, by Spectrum, is the chlorophyll pigment.
These are most active at 430 nm blue light and 660 nm red light.
According to US patent 6921182, the presence of light of about 612 nm improves plant health.
From the following figure, this corresponds to the peak of \"algae Blue protein.
Some of the overall response curves I \'ve found, such as the response curves for \"PAR\" are drawn out.
In addition, the spectral output diagram of some common white led is also drawn.
It turns out that the peak sensitivity of blue light to chlorophyll (at ~430 nm)
Almost exactly the same as the peak output of the white LED, so this is a lucky coincidence.
Suppose we have a plant with a leaf area of 1 square.
The chart shows when the light-
The intensity is about 200\"moles\" (umol)
Photons absorbed (
Particles of light)
Per second, this results in the conversion of CO2 molecules of about 8 umol/s into plant substances.
This 8/200 ratio gives the conversion of particles-rate of 4%.
Six times the strong light (1200 umol/s)
The growth rate of plants has only increased by about 3 times, because (
24 umol/s CO2)
So we can see that plants grow more in more light, but not linearly.
Returns are decreasing.
This shows that for a given light energy: 1)
The longer \"Sun Day \"(
Such as artificial light)
Increase growth and efficiency, 2)
It is better to have a diffuse light that illuminates the leaves evenly, not evenly, for example in a place where the light is larger
Strength of top and lower leaves
Low intensity-leaves (
Such as shading from insufficient growth).
Here\'s an old discussion about buildingfrom-
I now think the concept is out of date. . . .
Here is for reference only.
* For power supply, use a power supply with a slightly higher voltage.
I chose 12 v because it seems to be the most common \"brick\" voltage.
This allows you to connect more led in series.
You can always guarantee all LEDs in a given \"string (
Or branch of the circuit)
The same current simplifies things.
Again, the less strings mean the less resistance.
This reduces the number of parts etc, and the whole system can be more efficient, generating less heat, not overheating your factory and reducing the electricity bill.
Start the circuit design by adding the led to the string at will.
Add the voltage of all LEDs in a given string and adjust the number of LEDs per string to approach the supply voltage as close as possible without exceeding the supply voltage.
To do this, it helps to mix and match the LED color in the string, as each color has a different voltage.
The main concern is that you will not exceed the rated current of the LED.
Ohm\'s law says that the resistor value \"R\" in units of \"Ohm\" that you should use is given by this equation: R = (Vs -V_LEDs)
/LED, where Vs is the supply voltage, v _ LED is the sum of the LED voltage in the string, and I _LED is the number of amps for the led rated current, if v _ led is slightly lower than, then all you need is a very low value resistor like 1 ohm or less, let\'s say 1 amp string.
You don\'t need to drop more than one or two volts on the resistor.
If you\'re above 2
2 volts, why not add another LED?
Just calculate the correct resistor value for each string, after you build the circuit, you can measure the current through each string with an ammeter to ensure that the current does not exceed the specifications of the LED, especially when working at the highest temperature.
You can also calculate the current by measuring the voltage on the resistor and dividing it by the resistor. (
Ohm\'s law again).
The following figure is a simple schematic example.
12 volt power supply is very common and you should be able to find an extra power supply that you can re-
The purpose of doing so, or you can get one from your favorite remaining dealer, such as all electronics. com.
In this example, its capacity should be 2 amps or more, or whatever the sum of current in each string is.
The resistor value may need to be adjusted to limit the current in each branch to 1 amp, especially considering the negative temperature coefficient of the LED, the negative temperature coefficient may be as high-4 mV/deg. C (
View the \"data sheet\" pdf of the device).
I\'m also working on copper pcb.
Tracking resistance (
Or \"wire-wound resistance \")
Mainly because the resistance temperature coefficient of copper is positive (about +0. 4%/deg. C)
This will help to adjust the current through the led.
This approach looks promising so far.
In addition, this type of resistance is theoretically free (or under $1), simple (Suitable for DIY), and high-
This is the ideal choice for our design goals.
In theory, if the LED and copper resistors are firmly attached to the same radiator and are basically at the same \"housing temperature \"(
Although \"junction temperature\" is not necessarily the same, I will polish it now)
And then we can calculate the minimum resistance value we need to make the overall temperature coefficient higher than zero, so \"hot-
Could damage or damage the \"out of control\" of one or more LEDs \".
For example, for a 1 amp LED, we would like a voltage drop of at least 1 Volt on the resistor, so 0 according to Ohm\'s law. 4%/deg.
The C resistance will produce 4 mV/°c.
C, so canceled the LED-4 mV/deg. C.
Similarly, according to Ohm\'s law, a 1 ohm resistor is required to obtain a voltage drop of 1 volt at 1 amp.
This part can be purchased for less than $1, or it can be made for $2.
5\', or 4\', or 34 lines of line 36, etc. (
Wire size table _)Use high-
Brightness LEDs that can handle at least 700 mA to 1 amp current or more current, as they emit more light for money.
The most common red LED is made of a AAS with a wavelength of 625 nm.
It\'s not bad, but it\'s not ideal for plants. A \"super-Red\" or \"deep-
Red \"LED with a luminous wavelength of 660 nm (
Fyi led material there will be \"al\" or \"P\" in addition to \"AAS \").
These things are hard to find and may cost more money, but in theory they are worth more time to get.
Order from a website like digikey. com or mouser.
Even super bright led.
They actually list the wavelength and other useful specifications.
I used the number key for my LED selection (or Mouser)
Narrow search for \"parameters\"
Reduce the list to 2 to 3 wavelength ranges considered suitable for growing plants, and then use spreadsheets to narrow it down to the wavelength range with the largest radiation output per dollar, although this is not a must, in particular, LED costs have fallen sharply.
One of the problems I found is that some LED devices look better, but if they are small or \"good\"Equipment (
Very close pin), or non-
Standard assembly packs, then they are not easy to heat
Not using (aluminum)metal-
Core circuit board (MCPCB).
These can be hard to find, too expensive for hobbyest\'s DIY --offs.
It is also quite difficult to weld the LED correctly to such a circuit board, especially using only soldering iron.
Preheating on hot plates or small ovens can help, but even so.
For this reason, it may be easier to purchase a pre-LEDs
Assemble on board as much as possible.
The image shows an example of the PCB layout for electrical connections and heat-
Receiver requirements for LED arrays.
LED is a package of Cree XLamp components.
The configuration on the left has an advantage that the radiator can be a continuous component.
Consider the crazy possibility of \"building\"from-
\"Scratch\", can imagine this single heat
Assuming there is a good method of mechanically assembling and fixing parts, the sink can even be a piece of aluminum sheet metal.
I don\'t have a good way to do this in the basement, so now the industry --
The standard MCPCB is preferred because it can handle wires and heat
Transfer in a solid mechanical assembly.
If the led you bought is pre-
Assembled on board and then no additional board and surface
Welding needs to be installed.
This is much easier for DIY. . . .
In the old design, the PCB layout was started with the free software of the expressPCB to reduce the cost of the parts, which helps with the \"panel\" design.
12 growth in this case
Light fixtures can be produced in order of only $51 (
Plus shipping and peeling)
So keep the cost of the board at around $5 per increaselamp. Here, high-
Temperature adhesive or heat-
Can add the sink compound to the heat-
Connect MCPCB (or LED\'s heat-spreader)
With fin heat for the remaining CPU cooler-sink.
Alternatively, if you have a lot of high power led and you are trying to use a small radiator, you can use a connected fan or, if you want to keep the led and/or the air around you as cool as possible.
Ensure that the LED operating temperature is kept within the specification range, as their light output and equipment life can be significantly reduced.
You may want to search the Internet for information about adjusting the radiator size for your app.
The following information I now think is out of date for this project as it is simpler and more reliable to buy a pre-prepared LED
Mounted on metal
Core circuit board.
**************************************** **************************************** **************************************** ******************(OBSOLETE)
As a disclaimer, the concept is actually \"slum \".
But if you\'re on a desert island and don\'t have a MCPCB, you might consider this.
EBay does not do the same. .
Heat dissipation for LED-
Sink, a short solid copper wire 12 KW long ,(
As shown in the \"Romex\" cable of the type used for wiring sockets)
Can be used to make a solid copper straight throughhole via.
Cut a very short wire like this until its length is the thickness of the board, about 0. 062\".
One of these components can be inserted into the large channel in the PCB under each LED.
This will conduct heat from the LED to the radiator on the other side of the board.
This will make the led much lower than the welding temperature
By filling, higher light output, higher efficacy and longer lamp life will therefore be provided.
Copper holes may need to be returned-
Welding at the same time as the LEDs, so that all the gaps are welded. (
If this assembly method is not possible for some reason, then this heat dissipation design may not work well and an alternative design must be considered; see below**). The bottom-side (or \"solder-side\")
In the PCB, act as a radiator by having a copper pad around the copper.
As a simple ruleof-Thumb, hot-
The length of the hanger is about 100 times its thickness and will be effective. Expresspcb.
The thickness of the Com board is 0.
0017 \", so roughly speaking, the radiator will be effective in the range of about 0 radius.
17 \"* If the above design does not work, then one option for the alternative design is heating
Lifting and heating device
Receiver on the same side as the LED (
Component end].
One idea is to combine heat.
Absorb the mirror by making a mirror with aluminum. The low-
Typically available cost led tends to glow at a very wide angle (for example, a 120 degree angle.
In order to use this lamp, it would be helpful to have a reflective lamp fixture or a reflective wall near the factory.
There are many possible options for this.
My favorite option is the aluminum reflector mentioned in the previous section.
Alternatively, you may already have a reflective lamp fixture that can be reused for this project.
You might have some shiny aluminum flashing, or aluminum-
Or a lamp.
Some kind of colored material used to make the reflector.
Make sure it\'s not-
Flammable, use a large amount of electrical insulation and waterproof material when necessary to keep the electronic equipment dry.
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