cronus bhaskar spectrometer & colorimeter for light bulb measurements

specification | light bulb

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Contents 1 Cronus Bhaskar: 100% light bulb inspection ...................................... 3

2 Highlights ............................................................................................. 3

3 Application areas ................................................................................. 4

4 Optical configuration ........................................................................... 5

5 Cronus Bhaskar general specifications ............................................... 6

6 Cronus Bhaskar dimensions ............................................................... 7

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1 Cronus Bhaskar: 100% light bulb inspection The Cronus Bhaskar is the latest addition to the Admesy Cronus series. It

is based on the well-known Admesy spectro-colorimeter combination of a

VIS spectrometer with a tri-stimulus colorimeter. This unique combination

allows the user to choose between detailed spectral information of the

spectrometer and high speed colour, light and flicker measurements of the

colorimeter. The Cronus Bhaskar measurement system is designed as an

production-friendly extension to standardized measurement geometries

and conditions as described by CIE.

The new Bhaskar can be considered a mix between an integrating sphere

and typical cosine corrector measurement systems, optimized for fast,

accurate and repeatable inline measurements of LED bulbs. The optical

configuration of the Cronus Bhaskar is designed to cover an entire typical

E27 (or similar size) fitting light bulb, acting like an integrator. Offering

accurate and repeatable measurements in terms of colour, relative total

light output and optional flicker and start-up behaviour within a couple of

milliseconds for 100% inspection of lighting products.

2 Highlights Spectral range 380-780nm

Complete LED bulb measurement device

Spectral output or colour values output are both possible

Measures xy, CRI, lumen, spectrum, flicker

Measure flicker at 186.567 samples/second

Auto-range function

Excellent linearity

Dark current compensated

USBTMC compliant, SCPI command set, high speed device

Numerous interfaces, ideal for system integration

All spectral and flicker calculations are done inside

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3 Application areas The Cronus Bhaskar is used for measurements in solid state lighting

development and production processes. Due to the spectrometer the

Cronus is ideal to develop and monitor the spectral colour of LED light

sources during development, during long term testing or in production.

The colorimeter in the Cronus Bhaskar allows for high-speed 100%

inspection of your light bulb production checking the quality of all your

products, leading to increased product quality and production efficiency.

The spectrometer can be used for both spectral and colour

measurements.

Controlling your LED lighting system is crucial. Not only visible light flicker

within the range ~3 to ~70Hz but also invisible (non-perceivable) flicker

can have an effect on human health. Ranging from headaches, migraines

or impaired visual performance to an increased risk of seizures research

has shown that flicker is an effect with reason for concern.

The build-in colorimeter and large internal memory of the Cronus Bhaskar

allows for high speed measurements over a long period of time. This

enables the user to check flicker effects over time and during fade of the

light source. Adjusting the driver during development and checking the

flicker effect of each light source during production leads to increased

performance and end-user satisfaction and health.

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4 Optical configuration The Cronus Bhaskar is equipped with a fixed optical system which can

cover an entire regular E27 fitting type light bulb. In production lines for

100% inspection, a light bulb is positioned into the tube opening. The inner

surface of the tube acts as an integrator alike an integrating sphere and

allows for relative total luminous and radiant flux measurements. Typical

installation applications include multiple Cronus Bhaskar systems for

simultaneous measurements which are calibrated against a full

standardized integrating sphere measurement setup with a reference light

bulb.

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5 Cronus Bhaskar general specifications

Spectral measurement system

Spectral range 380-780nm

Optical resolution (FWHM)

2.3nm

Integration time 2.5ms – 20s

Dynamic range > 150000

Non - Linearity < 0.5%

Accuracy (Y,x,y)¹ 4% +/- 0.002

Repeatability (Y,x,y)² < 1% +/- 0.0005

Colorimeter measurement system

Photo detector Silicon photo diode using XYZ interference filters

Spectral response Approximates CIE 1931 colour matching functions

Dynamic range > 10000000

Measurement speed Luminance up to 186.567 samples per second

Accuracy (Y,x,y)¹ 4% +/- 0.002

Repeatability (Y,x,y)² < 0.5% +/- 0.0002

System configurations

Fixed integrator 75 mm diameter opening

Interfaces High speed USB, RS232, Ethernet, Trigger connections

Weight 3500 gram

Size (HxWxD) 339 x 130 x 130 mm

Shutter lifetime More than 1 million cycles

Shutter speed 70ms-120ms (close or open time, depending on temperature and lifetime)

Operating temperature 10-35°C

Power consumption 1750mW (USB powered) 1 Sufficient signal to noise ratio and relative to the calibration standard

2 Sufficient signal to noise ratio

Specifications are subject to change at any time without any notice

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6 Cronus Bhaskar dimensions

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Admesy B.V. Sleestraat 3 6014 CA Ittervoort The Netherlands T +31 (0)475 600 232 F +31 (0)475 600 316 www.admesy.com info@admesy.com

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Version 1.0.1 04/2017