The ILT710 Takes the Headache Out of Flicker Measurement!

 

What is Flicker?

Flicker is a temporal light artifact (TLA) caused by visible and invisible modulation of the light's output.  Unlike incandescent and fluorescent lamps, LED light sources can rapidly turn on and off with no residual dissipation, causing varying levels of flicker.  The level, frequency and percentage of flicker can have different impacts on the safety and health effects for both people and animals exposed to flickering light.  Flicker is extremely problematic for people with certain medical conditions such as migraines, epilepsy, and autism, to name a few.  Flicker can make moving objects appear stationary, creating a workplace hazard, and interfere with videography equipment, creating a visual disruption in filming. 

 

Measuring Flicker

While flicker % and flicker index time domain measures have been well known for many years, there are new metrics that add frequency domain components that must also be taken into account. The Stroboscopic Effect Visibility Measure (SVM), developed by Philips and CIE, identifies potential perception issues related to detecting the motion of objects. The metric is normalized based on controlled human subject testing with a value of 1 indicating that 50% of observers would perceive objects to be moving much slower than they are actually moving. A value of less than 1 would indicate less than 50% of observers would have the issue and a value of greater than 1 indicates that more than 50% of observers would see the issue. The ILT710 has a 128 x 64 pixel OLED display that clearly provides all the necessary measurements in a single view.

 

The ILT710's display will also show the change in intensity over time, providing a clear visual representation of the flicker frequency.

 

Quality and Accuracy

The ILT710 sensor provides a CIE photopic "human eye response" photodiode sitting behind a durable domed polycarbonate cosine correcting diffuser to provide accurate collection of light from all angles. The meter has a proprietary analog and digital signal processing to provide over-sampling at a rate of 50 kHz with true 12 bit resolution over light levels down to 1 lux, maintaining resolultion through all LED dimming levels including high PWM frequencies. The meter also provides ILT's NIST traceable and ISO17025 accredited lux calibration allowing the meter to serve the dual purpose of light-level compliance auditing and flicker measurement in office spaces, hospitals, schools, sports and entertainment arenas, and manufacturing environments, among others.
 

Characteristics of the ILT710 Flicker / Illuminance Meter

The ILT710 is a simple-to-use, low cost, hand-held, portable device.  The meter offers users accurate and reliable measurements with the following characteristics:

• High quality flicker measurement instrument for use in product development, field testing and measurement, and on-site audits
• Designed for use by non-technical personnel such as lighting designers, LED retrofit sales reps and applications engineers, and facility maintenance personnel
• CIE photopic human eye response
• Excellent cosine response
• Data transfer and power supply via USB
• Stand-alone operation with integrated lilo battery
• Memory for 1000 measuring points
• Graphical display of light intensity over time
• Evaluation of TLA to various calculation methods such as flicker%, flicker index, and SVM
• 50 kHz sampling rate, "instantaneous auto-ranging", 12-bit resolution
• Remote head with 3 foot cable allows easy access to work space and overhead lighting, while maintaining a clear view of the display
• Tripod mountable using 1/4-20" mount on sensor head
• NIST traceable ISO17025 accredited optical calibration
• Made in the USA 

 

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