What’s inside a modern 18W LED Fluoro T8 replacement tube from German company Mueller Licht?
EEVblog #533 – LED Fluoro Tube Teardown - [Link]
by Steven Keeping:
LEDs have many advantages over traditional lighting including efficacy, longevity, and robustness, but price is not one of them.
The reason why LEDs are expensive is partly because the manufacturing process used to fabricate the wafers from which the individual chips are cut is difficult and employs exotic materials such as gallium nitride (GaN) deposited on sapphire or silicon-carbide (SiC) substrates.
But recently, some manufacturers have proposed using silicon, the material routinely used to fabricate billions of integrated circuits (ICs) every year, as an LED substrate. Apart from potentially reducing the cost of LEDs, the use of mature complementary metal oxide semiconductor (CMOS) IC technology would allow fabrication in conventional wafer fabs that have spare capacity.
Will Silicon Substrates Push LED Lighting Into the Mainstream? - [Link]
Carolyn Mathas writes:
There’s a new high-density class of CXA arrays from Cree that doubles the lumen density for next-gen LED spotlights. The CXA 1520 is the first HD Array announced under the breakthrough technology. It enables lighting manufacturers to create products that deliver the same intensity and light quality as 39W ceramic metal halide (CMH) at up to 50% lower power.
Cree rolls LEDs with double lumen density and 50% less power - [Link]
With a height of only 4.5 mm are new terminal blocks able to connect LED modules and LED panels aesthetically and with a maximal reliability.
There are numerous SMT connectors on the market, which are suitable for usage on LED panels but even in other applications. That´s why it´s a logic question – why just Wago 2060?
Firstly it is because of a sophisticated construction of a terminal block with a globally known and million times proven screwless spring clamp CageClampS. This clamp has an optimum pressure on a wire ideally responding to a wire diameter, i.e. the thicker wire, the bigger pressure. Also thanks to this is the max. allowed current up to 9A (!). Further, it´s possible to install solid and ferruled wires even without tools. By a simple pressing to a terminal block (for example by a screwdriver), it´s possible to insert even fine stranded flexible leads and by similar way also to disengage. Features of a clamp don´t get worse neither after multiple disengaging of a connection and they remain stable even after a long period of operation.
From other positives it´s necessary to mention a “balcony” construction of an input portion, which makes installation of wires easier and faster. Sufficiently big flat area ensures a reliable application on assembly machines (pick-n-place). And finally – an aesthetic curved shape and a white/cream color cause, that connectors are inconspicuous and they don´t disturb on a PCB.
Terminal blocks are available in 1,2 and 3-pole version. You needn´t be in doubt that you missed development and you still don´t know a circuit operating on 1 pole – naturally the single-pole version is intended for connecting of several modules into series. A big plus is also availability of interconnecting both-sided pins enabling easy and aesthetic creation of a row (string) of several modules.
Pin spacing is 4mm and there´s also available a version with 8mm pin spacing with operating voltage of up to 600V. Connector casing is made of an advanced material (glass fibre reinforced PPA) with a very wide range of operating temperatures.
Novelty is also a newer version – Wago 2061 with up to 12A max. current. Detailed information will provide you the Wago 2060 brochure.
In case of interest please contact us at firstname.lastname@example.org.
Wago 2060 terminal blocks don´t overtop LEDs – [Link]
ba0sh1.com reverse engineered a cheap LED voltmeter he bought from Taobao and made it run on a I2C bus. He writes:
I’m planning to build a EEVblog-ish constant dummy load for battery and power supply testing. Dave in his build used a LCD voltmeter for the display. In the senseless pursuit of difference, I tried other display solutions including character LCD, graphics LCD, OLED, TFT, AMOLED, IPS, which resulted in several previous blogs but nothing ends up to be satisfactory. Along with the complexity grows exponentially from one solution to another, I slowly start to feel the importance of KISS concept, keep it simple stupid. All I need is just a number display, nothing fancy, nothing pricey, nothing takes my attention away from the analog circuitry. I decided to go back to the basic 7-segment LED display. “Simplicity is the ultimate sophistication”, how elegant it is!
Hacking a cheap LED voltmeter - [Link]
Don´t let yourself get confused by miniature dimensions – small SMT LEDs produce surprisingly strong light.
SMT LEDs enjoy a big popularity because of their size but also thanks to a fast and simple assembly to PCB on automatic machines. In comparison to wire-leaded types, a vast majority of SMT LEDs doesn´t contain optics, thus radiating in a wide beam angle. That´s why is their light visible even from wide viewing angles and at the same time it enables to easily reach a uniform backlight of panels, displays, …
From the smallest SMT LEDs you can find in our store sizes „0603“ (KP-1608) and „0805“ (KP2012) from company Kingbright. Particularly in the Kingbright. Particularly in the KP-2012 series can be found several types with a luminous intensity in the order of hundreds mCd. A novelty in the Kingbright portfolio are series SR-J4 (640 nm – red) and series ZGK (525 nm – green) comprising LEDs of various dimensions. For example the new type KP-2012SRC-J4 (640 nm) has a luminous intensity of up to 600 mCd (@20mA).
In general, all KP series LEDs are low-profile (thin), but at extreme space requirements, the solution exists in an ultra-thin version KPT (only 0.75 mm height – KPT2012).
Naturally, it´s not always necessary to have a high light output (for example at indoor usage), that´s why at several types can be found a version with a higher and also with a lower luminous intensity, what is usually also reflected in a price of a given type. In stock we keep the most requested types suitable for majority of applications. Should you have interest in types which we don´t keep in stock, please don´t hesitate to contact us at email@example.com.
Small but powerful LED series KP- 2012 – [Link]
Seven segment LED displays are known to be resource and power hungry. But because they are visually so charming and readable from a far viewing distance and at a much wider viewing angle as compared to any other electronic displays, they are still hugely popular. The required number of I/O pins to drive the LED segments can be reduced significantly by using an additional dedicated hardware. For example, the MAXIM’s MAX7219 device allows you to interface 8 pieces of seven segment LED modules using only 3 I/O pins of Arduino or any other microcontroller.
High-voltage seven segment LED display driver with SPI interface - [Link]
LEDger Led (polarity) tester:
Everytime I solder a SMD LED on a pcb I have to turn on one of my multimeters and flip it over to diode-test mode and then probe the SMD LED to see which connector is the anode and which is the cathode. The LEDger is a small PCB with a button cell battery and smd footprints that allows me to, while still holding the LED in my tweezers. just hold it onto one of the footprints and see if it lights up or not.
LEDger Led (polarity) tester - [Link]
DOT. @ instructables.com
I and my friends like to have fun in summer. We like to fool around with music when we are camping. To make those parties more likely to professional ones I have made portable 9V LED strobe. For my surprise it really gives a big effect. I hope you will like it!
DIY portable LED strobe - [Link]
While LED based solid-state lighting continues to gain ground, and several major challenges have been solved, some still remain. Energy savings and the savings that a long product lifetime brings certainly have spurred adoption in a long list of applications. Cities, sports facilities, retail, medical, residential and industrial use, are all on the rise. The move to LED-based solid-state lighting is gaining ground based on the promise of energy savings and long lifetime.
Six LED challenges that still remain - [Link]