LED vs other light sources

Efficency of some light sources (for comparison):

Incandescent bulb: 10 lm/W
Halogen bulb: 15 lm/W
Energy saving lamp: 40 lm/W
LED: 60 lm/W

Source: Helen magazine Helmikuu 2013


  1. Wichita-born and raised Feyyaz is addicted to LED lighting bulbs, autographed memorabilia, gardening. And lastly his stimulus arises from exploring new places and regions for instance to Hamada. says:

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  2. Tomi Engdahl says:

    Measuring Single LEDs
    Posted Nov 11, 2013 at 8:19 am
    Pocket-sized LED measurement solution offers laboratory-grade precision

    Typical measurements can include: Lumens (luminous flux), CCT (correlated color temperature according to CIE standards), CRI (color rendering index according to CIE standards), COLOR (color coordinates according to CIE 1931 and CIE 1964), and mWatt (radiant power value).

  3. Tomi Engdahl says:


    Successfully funded on Mar 2013 via a kickstarter campaign, The NanoLeaf takes energy efficient lighting to the next level.

    Made up of flat PCB folded into a 3D structure Each bulb has an estimated run time of 30,000 hours equivalent to a standard 100W unit and generates 1600 lumens.

    The Nanoleaf is the first LED bulb made with printed circuit board technology. Its unique design convention allows for the many color and design options Unlike other LED light bulbs, the NanoLeaf bulb directs light in all directions. This allows for light to be distributed evenly, comparable to traditional light bulbs.

  4. Tomi Engdahl says:

    Lightfair 2014 ‘Most Innovative Product of the Year’ award goes to Acuity Brands

    Considered the most important industry awards ceremony honoring industry innovations, the Most Innovative Produce of the Year Award is the highest honor presented by an independent panel of lighting professionals, recognizing the best new product.

    Open luminaires from Peerless use constructive occlusion to reflect and diffuse LED light across an inner arch and back down to produce soft, comfortable illumination from a lens-free linear form. Open luminaires can be specified with an integrated sensor and controls module for daylight dimming, occupancy detection, lumen management and system networking. They are available in recessed and suspended forms.

  5. Tomi Engdahl says:

    LED lighting: Not all solutions are created equal
    Ratings and certifications help validate high-quality LED lighting products.

    Learning Objectives:

    Know the risks of cheap/poorly designed LED lights.
    Identify the factors to consider when investing in LED lighting solutions.
    Understand the differences in LED light quality.

    Inexpensive LED lights with poor design and inferior manufacturing considerably reduce the benefits of LED solutions. Manufacturers choosing the cheapest option are at risk for experiencing:

    High failure rates
    Short lifespan
    Dim, inconsistent light and odd light colors
    Little to no energy savings over fluorescent lights
    Overheated fixtures
    Electromagnetic interference with surrounding equipment.

    Electrical design plays a critical role in lifespan-or failure rate. Diodes, power supply, and electrical components are a major factor in LED performance and lifespan.

  6. Tomi Engdahl says:

    LED-lit urban farms aim to transform blighted cities with jobs, fresh food

    A group of high-tech urban pioneers is using LEDs to power a large indoor vertical farming system in Newark, NJ. When complete, AeroFarms’ latest urban agriculture system is expected to enough produce pesticide-free greens and herbs to feed over 50,000 people while using 3% of the space required by conventional dirt farming. By farming in repurposed warehouses or abandoned industrial site, the company’s locally –grown, locally-consumed products create new jobs, helping boost local economies and reduce transportation-related emissions by more than 75% on average.

    The so-called “Aeroponic system is a type of hydroponic technology that grows plants in a mist. The seeds are embedded within a cloth medium where they are germinated and exposed to with LEDs which emit specific wavelengths of light for more efficient photosynthesis and less energy consumption.

  7. Tomi Engdahl says:

    LED light to produce the entire light spectrum

    American Silicon Valley headquartered LED Engin has introduced led component, which was the first in the world to produce seven different colors. It can be implemented in the entire color spectrum repetitive stage light applications.

    LZ7 circuit 7 is independently controllable LEDs 7 x 7 millimeters platform. Chassis development has been a core material and design of thermal management.

    Source: http://etn.fi/index.php?option=com_content&view=article&id=4201:ledivalo-tuottaa-koko-valospektrin&catid=13&Itemid=101

    LuxiGen™ Multi-Color Emitter Series
    LZ7 Flat Lens Emitter
    RGBW-PC Amber-Cyan-Violet

    7-color surface mount ceramic LED package with integrated flat glass lens
    Red, Green, Blue, Cool White, PC Amber, Cyan and Violet enables richer and wider color combination for more sophisticated color mixing
    Compact 3.8mm Light Emitting Surface (LES) and low profile package maximize coupling efficiency into secondary optics
    20W max power dissipation in a small 7.0mm x 7.0mm emitter foot

  8. Tomi Engdahl says:

    “World’s Brightest” Flashlight

    With the crazy extremes of light flux density that are possible these days, we’re putting quotation marks around “world’s brightest”, but it’s abundantly clear that this flashlight build is very much too bright. No, really. Why would you want a flashlight so bright that you have to wear sunglasses to look at anything that’s within a twenty foot radius?

    Because you can. [Mads Nielsen] combined 18, one hundred Watt LED units with some giant machined heatsinks, fans to cool those heatsinks, lenses, and other hardware to make a device that turns electrons into photons at an alarming rate. Each chip-on-board LED package requires 32 Volts

    World’s Brightest LED Flashlight (1800W / 162.000 Lumen)

  9. Tomi Engdahl says:

    Home> Community > Blogs > BenchTalk
    My kingdom for a 12V adapter

    Our new house is inching towards 100% LEDness, from LED “bulbs” in standard light fixtures, to custom LED lighting, to flexible LED light strips. It’s the latter I’m having some problems with.

    After some preliminary research, I decided that the only affordable sources for LED strips would be from among the numerous Shenzhen & Hong Kong mega-retailer Websites. There, you’ll find standard 5m LED strips in the $4-$20 range, instead of the $50-$100 range typical of other sources.

    After some preliminary research, I decided that the only affordable sources for LED strips would be from among the numerous Shenzhen & Hong Kong mega-retailer Websites. There, you’ll find standard 5m LED strips in the $4-$20 range, instead of the $50-$100 range typical of other sources.

    With the LEDs themselves taken care of, I turned to power sources. In the basement, I’ll probably use some centralized high current 12V power supplies..

    While I’m willing to accept some creative LED specs, I do expect a 5A adapter to be a 5A adapter. Silly me. They turned out to be more like 2A, and to add insult to injury, the output cables appeared to be vastly undersized

  10. Tomi Engdahl says:

    What you don’t know about LED light intensity curves for grow light apps

    The light intensity curves for LEDs, regardless of whether they are collimated with a lens or reflectors, follow a bell shaped curve (often referred to as a “Lambertian“ curve). The 50% intensity point for an LED with no optic (bare LED) is virtually always at approximately 120 degrees (60 degrees in each direction).

    The 50% point (known as the “beam angle” or “viewing angle”) is a lesser number of degrees depending on the collimating specification used. The beam angle is the total angle in both plus and minus directions.

    What is not commonly known by those not experienced in the physics of LED light emission and optics is that the Lambertian LED light intensity curves can be very misleading in terms of how much light is actually arriving at the receiving end.

  11. Tomi Engdahl says:

    Can Incandescent Bulbs Make a Comeback?

    Research using a re-radiating nanostructure around a planar incandescent surface may give the classic but inefficient light source a second chance.

    It’s natural to feel at least a little bit of sadness, and even pity, for the venerable incandescent bulb. It was heralded as a technological miracle, brought safe, effective lighting to the world, and it completely transformed society. Yet, it is now derided as an inefficient energy hog and thus a bad thing.

    A combination of energy costs and regulatory mandates have given the blub little room to maneuver, and it is being superseded in most consumer and many commercial applications by CFLs and, to an increasing extent, by LEDs (although incandescents are still the preferred or only option for many specialized applications). Phasing out incandescents makes logical sense, since they have efficacy of only about 2%-3%, compared to several times that for CFLs (7% to 15%) and LEDs (5% to 20%).

    That’s why I found a recent update from MIT of great interest. A research team has done work, including a demonstrated proof of concept, on a radical approach for increasing the performance of the incandescent bulb

    Thus far, they have achieved efficacy of about 6.6%, which is 2x to 3× that of a regular incandescent bulb. Note that the “filament” they use is not a conventional tungsten wire; instead, it is thin, planar sheet of tungsten which has been laser cut to fit.

    Will this design bring back the incandescent bulb, with its primitive glow and pleasing color temperature? I certainly don’t know.

    Further, we also know that developments in one area (even dead-end ones) often become the basis of innovation in others.

  12. Tomi Engdahl says:

    Understanding LED Application Theory And Practice

    LEDs are the most efficient way to turn an electric current into illumination. When a current flows through a diode in the forward direction, it consists of surplus electrons moving in one direction in the lattice and “holes” (voids in the lattice) moving in the other. Occasionally, electrons can recombine with holes. When they do, the process releases energy in the form of photons.

    This is true of all semiconductor junctions, but LEDs use materials that maximize the effect. The color of the light emitted (corresponding to the energy of the photon) is determined by the semiconductor materials that form the diode junction.

    The latest high-brightness (HB) white LEDs are made possible by the discovery of semiconductor materials that produce blue or ultraviolet photons. In addition to the diode, an HB package contains “yellow” phosphors on the inside of its lens. Some “blue” photons escape, but others excite the phosphors, which then give off “yellow” photons. The result can be tuned in manufacturing to produce “white” light.

    A great deal of LED engineering relates to controlling the quality of this light.

  13. Tomi Engdahl says:

    LED produces over 2500 lumens

    Cree’s XLamp XHP50.2 LED delivers up to 7% more lumens and 10% higher LPW (lumens per watt) than the first-generation XHP50 LED in the same 5×5-mm package. The XHP50.2 provides more than 2500 lumens from its 6-mm light-emitting surface, helping to reduce the size and cost of new designs in applications ranging from spot to street lighting.


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