Products, Materials & Tools | Nov 13, 2006

Future Lighting Solutions launches Usable Light Tool

Often, when evaluating high-power LEDs, typical flux values, which are measured at a junction temperature of 25°C, are considered only. Such an analysis is incomplete and inaccurate for determining the expected level of light from the light source in a "real world" environment.

The purpose of this tool is to provide a true "real world" evaluation and comparison of high-power LEDs by taking into account the effects of 7 critical relationships (see diagram):

Working principals of the Usable Light Tool

While respecting the maximum Junction Temperature specified, the Usable Light Tool optimizes the Drive Current to maximize the light output of the selected LED. The models created for each LED are based on values obtained directly from the LED manufacturer's datasheets.  The tool incorporates 3 major sources of data as well as a variety of secondary data points, which are explained below.

Data Source 1:  As seen in the graph below the Light Output increases as the Drive Current does.

However, as the drive current increases, so does the power consumption, and the greater the power consumption, the more heat is generated.

Data Source 2:  As seen in the graph below, as the Drive Current increases, the Forward Voltage increases.

Since power consumption is the product of current and voltage, the rise of Forward voltage also increases the power consumption, which generates additional heat.

Data Source 3:  Finally, as seen in the graph below, the Light Output decreases as the Junction Temperature increases.

The Usable Light Tool also incorporates the following data points for running it's proprietary current optimizing algorithm:

  • Ambient Temperature

  • Heat Sink Thermal Resistance

  • Power LED Junction to Case Thermal Resistance

  • Effects of Junction Temperature on Forward Voltage

  • Recommended Junction Temperature

  • Number of LEDs

  • Maximum allowable Drive Current

  • Power LED Flux Bin

  • Power LED Forward Voltage Bin

As was stated above, the Usable Light tool calculates the drive current that will maximize the usable flux that will not exceed the advised maximum junction temperature.  However, the optimal current also maximizes the luminous efficacy for the calculated maximum usable flux.  Therefore, the optimal current may not always be the maximum current.

See Future Lighting Solutions in our buyer's guide.

Add comment

You can add a comment by filling out the form below. Plain text formatting. Comments are moderated.

Question: What is 1 + 6 ?
Your answer:
FEATURED

Nichia Showcases LEDs with 'Light so Good'

Nichia Showcases LEDs with 'Light so Good' At Light + Building 2020 held in Frankfurt, Nichia – the leader in high-performance LED solutions – reveals it will present at least three complementary technologies to improve the delivery of light quality under an over-arching banner of 'Light so Good'. Read more »

EDITORIAL

Future Lighting Solutions Launches Offline Lighting System Selector Mobile App for iOS and Android

Future Lighting Solutions Launches Offline Lighting System Selector Mobile App for iOS and Android Montreal, Canada (mynewsdesk) January 21, 2020 - Future Lighting Solutions (FLS), a leading provider of solid-state lighting, engineering expertise and design tools, is proud to announce the launch of their new offline Lighting System Selector for iOS and Android devices. Read more »

EDITORIAL

Researchers from Hokkaido University Let Europium Shine Brighter

Researchers from Hokkaido University Let Europium Shine Brighter A stacked nanocarbon antenna makes a rare earth element shine 5 times more brightly than previous designs, with applications in molecular light-emitting devices. - The europium Eu(III) complex with nanocarbon antenna emitting fine red light. Read more »

EDITORIAL

Zhaga Summit – September 23rd in Bregenz

Zhaga Summit – September 23rd in Bregenz Luger Research and Zhaga are proud to announce that the 2020 LpS/TiL conference will host a Zhaga Summit. This one-day event will provide application-driven introductions to the latest Zhaga standards, review their market reception, and solicit inputs from the specifier community through workshops. Read more »

EDITORIAL

Research Confirms that Light Pollution Can Suppress Melatonin Production in Humans and Animals

Research Confirms that Light Pollution Can Suppress Melatonin Production in Humans and Animals Melatonin sets the internal clock. Researchers from IGB in an international team have analyzed data on the impact of light pollution on melatonin formation in humans and vertebrates. They found that even the low light intensities of urban skyglow can suppress melatonin production. Melatonin ... Read more »

EDITORIAL

CIE Announces Availability of New Documentation: Test Method for OLED Luminaires and OLED Light Sources

CIE Announces Availability of New Documentation: Test Method for OLED Luminaires and OLED Light Sources The new CIE International Standard S 025-SP1/E:2019 is a supplement to CIE S 025:2015 Test Method for LED Lamps, LED Luminaires and LED Modules specifies the requirements for measurement of electrical, photometric, and colorimetric quantities of OLED luminaires and OLED light sources. These sources ... Read more »

EDITORIAL

Care, Caution & Awareness Are Needed When Using LED Lights

Care, Caution & Awareness Are Needed When Using LED Lights Kyra Xavia is a researcher, educator and investigative journalist based in New Zealand. Her roles as general secretary of the Light and Lighting Research Consortium (LLRC), delegate for the International Dark Sky Association (IDA), New Zealand Ambassador for Women in Lighting 2019, and co-leader of ... Read more »