New aluminium profiles in our portfolio will help you to apply LED strips or other linear LED light sources.
LED strips or PCBs with LEDs are in fact only a semi/product, which should be in the most of cases mounted into an appropriate profile. Two new aluminium profiles are excellently suitable for this purpose, with the possibility to buy a transparent or semi/transparent plastic cover.
Advantages / Features:
- ideal for LED srips and mid-power LEDs
- suitable for panels and for furniture
- usage without or with embedding
- 1m long
- aesthetic and safe solution
● Profile ZH-9099/1000 is suitable to be embedded into panels, furniture and similar.
● Profile ZH-9460/1000 is ideal for installation without embedding – on a surface. That´s why it features somewhat higher cooling properties.
Both types are anodized (natural elox) and they can be equipped with termination profiles and transparent plastic covers. Transparent cover transmits almost 100% of light, thus almost not affecting the luminous flux from LEDs. Semi-transparent cover transmits 75% of light and provides a soft diffused light. In case of interest in these heatsinks, high-power LEDs or LED strips, please contact us at firstname.lastname@example.org.
Comfortable and safe installation of LED strips with new profiles – [Link]
Embedded Lab has posted a new project of constructing an 8-digit seven segment LED display board with a serial interface. Seven segment LEDs are very bright and attractive display devices. However their use in microcontroller projects is sometime limited by lack of I/O resources. The use of MAX7219 allows you to add 8 digits (more if cascaded) of seven segment LED displays using only 3 I/O pins of the microcontroller, and provides full control of all the digit segments and decimal points.
MAX7219 device can be easily interfaced to Arduino using LedControl library. The library also supports cascading of multiple MAX7219 devices.
The serial 8-digit seven segment LED display kit is also available for purchase on Tindie.
Serial (SPI) 8-digit seven segment LED display kit - [Link]
by Steven Keeping:
High-brightness LEDs tend not to burn out rapidly. Rather, they slowly fade away. A carefully designed LED lighting system can see the light source last for up to 50,000 or even 70,000 hours before the illumination is no longer sufficient for the intended job.
What causes the chip to lose luminosity, and can anything be done to arrest the decline? This article reviews the physics behind an LED’s photon generation to explore what happens when the device is new, and then why the performance inevitably deteriorates as the chip ages.
Understanding the Cause of Fading in High-Brightness LEDs - [Link]
The XLamp XM-L2 LED by Cree delivers up to 186 lumens-per-watt at 350 mA at 25°C, performance. Using its revolutionary SC3 Technology LED platform, the XM-L2 LEDs double lumens/dollar, delivering 20% more lumens-per-watt over the original XM-L LED. [via]
Brightest single-die LED raises industry bar - [Link]
This project is an all-digital-hardware LED Christmas tree we’re calling the Christmas Tree O’Digital Logic. The tree itself is composed of 64 LEDs built into a spiral sitting on a piece of protoboard. Underneath, the controller uses shift registers and a 555 timer to create two modes of display: a predictable pattern and a random pattern. This should light up any desk or shelf and bring merriment to you.
Christmas Tree O’Digital Logic - [Link]
by Steven Keeping:
High-efficiency LEDs are impressive devices. Many leading semiconductors companies sell proven, commercial devices with efficacies in excess of 100 lm/W and lifetimes exceeding 50,000 hours.
However, while contemporary products perform well, indium gallium nitride (InGaN)-based white LEDs (the most common type produced today) have a theoretical efficacy limit of around 250 lm/W, so there is still plenty of room for improvement. Factors such as carrier injection-, internal quantum-, and light extraction-efficiency are under intense scrutiny by academics and researchers working for the leading LED companies alike.
This article reviews the progress that these scientists and engineers have made so far, and casts an eye forward as to what improvements we might see next.
What’s Next for High-Power LEDs? - [Link]
Literally endless long bands of a linear light can be produced with LEDs of the Duris E3 and E5 series. A wide-angle beam and a very uniform light distribution make these LEDs very easily applicable.
This is exactly the case of Duris E3 and Duris E5 LEDs. Thanks to their compact SMT packages, they can be freely used on PCBs of virtually any shapes. Small dimensions of both LEDs enable tight placing of LEDs next to each other. OSRAM Duris E3 and Duris E5 LEDs feature a very homogenous radiation pattern in a wide angle (120°) and a high efficiency of up to 110lm/W. The result is a perfectly homogenous light without visible dots. That´s why they´re perfectly suitable for a construction of replacements of classic fluorescent lamps (CCFL) (T5 a T8) and bulbs. Duris E3 and E5 have very similar optical specification, the main difference is in the maximum current of 30mA/E3 versus 180mA/E5.
It is good to realize, that a maximum current of LED has nothing in common with efficiency, i.e. even low-power LEDs feature a high efficiency (lm/W). That´s why approximately the same-efficient light source can be created by 1 OSRAM OSLON Square LED, but even by for example 50 pcs Duris E3 or 8 pcs Duris E5. An advantage of high-power LEDs is an easy achievement of a high luminous flux from a small area (spot lights) and an easy application of optics. On the other hand, less powerful LEDs are usually more easily applicable, no secondary optics is necessary and often even no additional heatsink is necessary because the power is dispersed on a bigger area and already the PCB itself is often able to lead away and dissipate a generated heat. That´s why the usage of Duris E3 and E5 is very simple and virtually immediately after soldering LED to a PCB we gain a working source of a homogenous light. .
A light without an end with OSRAM Duris E3 and E5 LEDs - [Link]
The TPS92510 by Texas Instruments is a 1.5-A constant current DC/DC buck converter with a combo of frequency synchronization, pulse-width modulation (PWM) dimming and thermal foldback firsts. Used with the WEBENCH LED Architect, users rapidly design a power management circuit to drive a string of up to 17 high-brightness LEDs at up to 97% power efficiency in automotive, industrial, and general lighting applications.
The TPS92510 operates with fixed frequency by using its internally generated clock or via synchronization to an external PWM clock source. Thermal foldback ensures light output remains even in an LED over-temperature condition, adding safety. [via]
- 3.5-V to 60-V input voltage operating range supports a wide variety of DC LED lighting applications, including area and street lighting.
- Fixed switching frequency range from 100 kHz to 2.5 MHz can be synchronized to optimize for efficiency or solution size.
- LED thermal foldback with external negative temperature coefficient (NTC) protects LED array from over-temperature while maintaining reduced light output.
- Dedicated PWM dimming input from 100 Hz to 1 kHz adjusts LED brightness without color shift or perceivable flicker.
Buck converter drives high-brightness LEDs - [Link]
This article shows you the process involved for building an 8x8x8 LED cube (that’s 512 LEDs!). It explains both how to build the LED cube and how to make the electronics that control it. Don’t miss the demo videos!
Building An 8x8x8 LED Cube - [Link]
Carolyn Mathas writes:
The LT3763 by Linear Technology is a synchronous buck LED driver controller that delivers more than 300W of LED power. With an input voltage range of 6V to 60V, it targets such applications as automotive, industrial and architectural lighting. Output voltage from 0V to 55V enables it to driver LEDs in a single string. The driver features input and output current monitors and limiting and accurate input and output voltage regulation.
Buck LED driver delivers 300W of power - [Link]