Characteristics and Uses of SMD LEDs
– LED: a variety of SMD bulbs
– Advantages and disadvantages of LED lamps
– Precautions to take with SMD LEDs
– LED shade: choosing it well
LEDs are the future bulbs, and you can have them today! They allow many cycles of on and off and produce the light without waiting.
Some of these lamps are, at the same time, durable (from 2 000 to 40 000 hours), sober, and resistant to shocks and cold. These qualities, attributed to conventional LEDs, are they found in the Led SMD, which is also more powerful? Answer in our tip.
LED: a variety of SMD bulbs
The SMD (Single Mounted Device) LED (Light Emitting Diode) or SMD (Surface Mounted Component) is so named because the component is soldered onto the lamp’s circuit board:
– SMD bulbs or spotlights juxtapose several electronic components to offer more power than conventional LEDs. They come in the form of small flat yellow pellets.
– They are, therefore, LED modules, which assemble one or more LEDs on a printed circuit board, associated or not with a light control device.
– They may require specific luminaires or adapt to the existing ones. The lamps contain electronic components that produce light, crossed by a current.
These bulbs differ according to the type of SMD used to make them. For example, typical applications use LEDs:
– SMD 0805,
– SMD 1210,
– SMD 3528,
– SMD 5050.
Please note: These numbers indicate the size of the chips. The size of the SMD 5050 LED allows for the insertion of three light components, while the others contain only one. A product equipped with SMD 5050 LEDs can be 3 to 5 times more potent than a product provided with the same number of SMD 1210 or 3528 LEDs.
These lamps still have high prices (from $17 TTC to just under $30 TTC).
Advantages and disadvantages of LED lamps
The great flexibility of use
Among the advantages:
– the surface-mounted component on the PCB has an impact on cost reduction, but more importantly, on the thickness of the finished product;
– they have great flexibility of use;
– Led modules like SMD Led can integrate control electronics for better lighting management:
◦ presence detector,
◦ dimmer, etc.;
– just like conventional LEDs, the angle of diffusion is quite wide (140 to 150°);
– like other Led, they:
◦ operate in very low voltage;
◦ are insensitive to shocks;
◦ can be inserted in many applications;
◦ do not contain mercury.
LEDs: more exposed to heating
One disadvantage, the SMD led heats up more than a conventional Led, which is not without consequences on the lifespan.
– the isolated Led offers energy efficiency of 150 lm/W to 220;
– the SMD LED lamp has an efficiency of 40 to 80 lm/W.
This decrease in efficiency is attributed to the heat produced by the diodes in the lamp.
Energy label for an informed choice
Another disadvantage is the uneven quality of the LEDs found on the market. The energy label, mandatory since September 2013, displays important information on the packaging to choose a bulb:
– number of cycles on/off;
– Mercury content (Hg);
– manufacturer’s website;
– luminous flux of the lamp in lumens;
– color temperature;
– length and diameter;
– an indication of non-operation with some dimmers;
– life span;
– time to 60% of total luminous flux;
– energy class and consumption;
– beam angle for spotlights.
Precautions to take with LED SMD
Led lighting with a high emissivity in the blue leads to a photobiological risk.
The sources of high color temperature have a share of emission in the blue. More important, that presents a risk to the eyes. It is advisable not to:
– stare at this source in its axis of emission;
– stand too close to it for a long time.
Sensitive populations (children, people without or non-protective lenses) are the most exposed.
This risk highlights the importance of the luminaire. It must not allow direct exposure to the LED and must be equipped
– either with diffusing materials: a globe, or a bowl;
– or optical systems: diffusers, reflectors, louvers, refractors, secondary optics.
Over-lighting, poor color rendering, and non-homogeneous light are to be avoided.
Led tint: choose it well
You must adapt the lighting to the activity:
– Most activities performed in the domestic setting (excluding precision work) require a warm to a neutral light shade of 2,700 K to 4,500 K.
– In addition, for comfort, the color rendering should be close to that of natural light (CRI ≥ 80). Therefore, lighting experts recommend LED lamps with warm to neutral tones.
– In addition, these lamps have a lower emissivity in the blue and, therefore, a low photobiological risk, if any.
Good to know: in indoor lighting, it is accepted that a luminance higher than 10,000 candelas per m² is detrimental to visual comfort.