Renewable Energy

Indal Industria Aurora Streetlamp

Posted by Marcel van der Steen in CFL Light Bulbs, Light measurements Add comments

This time a streetlamp is being reviewed: one with a sodium colored light with an orange hue. It is the Aurora Streetlamp of the brand Indal Industria.

Also available are the measurement data in Eulumdat format. The measurements were done without the transparent cover of this lamp.
See this overview for a comparison with other lightbulbs.

Summary measurement data

parameter meas. result remark
Color temperature 1843 K This lamp gives a light with a yellow to orange hue.
Luminous intensity Iv 1034 Cd
Beam angle 162 deg A wide beam. This is the average value. To different directions this light has a different beam (by design).
Power P 90.4 W
form factor street light
Power Factor 0.95 For every 1 kWh net power consumed, there has been 0.33 kVAhr for reactive power.
Luminous flux 6016 lm
Luminous efficacy 67 lm/W
CRI_Ra 19 Color Rendering Index.
Coordinates chromaticity diagram x=0.5460 and y=0.4117
Fitting 230V Needs connection to 230 V grid voltage.
L x B x H external dimensions 565 x 256 x 190 mm Maximum dimensions, this is without cover. With cover this light is 288 mm high.
L x B dimensions of luminous area 250 x 195 mm For this light the leds are situated in a reflector-bucket that reflects light. Herewith given are the dimensions of this bucket. The concept of luminous area is used in programs as Dialux / Relux.
General remarks The ambient temperature during the whole set of measurements was 20.0 deg C.Warm up effect: enormous effect, this light needs 5 minutes to warm up.

Voltage dependency: power and illuminance are dependent on the lamp voltage.

For the Eulumdat file follow this link.

Light diagram in Eulumdat format

This streetlamp is specifically designed to generate light at the needed spots underneath the lamp. Also to generate no light where this is not needed. The light pattern diagram in Eulumdat format show where the light is radiated to.

Light diagram giving the radiation pattern in the C0-C180 and the C90-C270 plane.

This diagram shows the intensity pattern for the planes C0-C180 and C90-C270, see also the photo for the indication of these planes. The unity is given in Cd/1000lm, meaning the luminous intensity in Cd when in the light there would be a total of 1000 lumen light output. Defining this value in Cd/1000 lumen makes it possible to compare light bulbs.

The C0-C180 plane the intensity is in a beam 45 degrees forwards. In the diagram to the right and in the picture to the left.

In the C90-C270 plane there is a high intensity to the sides, not only at 50-60 degrees sideways but also a considerable amount of light beyond 60 degrees.

Luminous flux

With the luminous intensity data as a function of the inclination angle, it is possible to compute the luminous flux.

The result of this computation for this lamp is a luminous flux of 6016 lm.

The radiation pattern of the streetlight.

This radiation pattern shows a wide beam.

When using the average values per inclination angle, the beam angle can be computed, being 162 graden. However, this value is dependent from the plane observed.

Luminous efficacy

The luminous flux being 6016 lm, and the power of the streetlight being 90.4 W, yields a luminous efficacy of 67 lm/W.

A power factor of 0.95 means that for every 1 kWh net power consumed, a reactive component of 0.33 kVAr was needed.

Light bulb voltage 230 V
Light bulb current 430 mA
Power P 90.4 W
Apparent power S 95.1 VA
Power factor 0.95

Color Temperature and Spectral Power Distribution

The spectral power distribution of this lamp.

The measured color temperature is about 1843 K, and the light is yellow-ish / orange-ish.

Chromaticity diagram

The chromaticity space and the position of the lamp’s color coordinates in it.

The light coming from this lamp is on the Planckian Locus (the black path in the graph).

Its coordinates are x=0.5460 and y=0.4117.

Color Rendering Index (CRI) or also Ra

Herewith the image showing the CRI as well as how well different colors are represented. The higher the number, the better the resemblance with the color when a black body radiator would have been used (the sun, or an incandescent lamp).

Each color has an index Rx, and the first 8 indexes (R1 .. R8) are averaged to compute the Ra which is equivalent to the CRI.

CRI of the light of this lightbulb.

The value of 19 is lower than 80 which is considered a minimum value for indoor usage. This is known for Sodium lamps; they render color very badly.

Note: the chromaticity difference is 0.0082 which is higher than 0.0054, which means that the calculated CRI result is not meaningful.

Voltage dependency

The dependency of a number of lamp parameters on the lamp voltage is determined. For this, the lamp voltage has been varied and its effect on the following lamp parameters measured: illuminance E_v [lx], color temperature CT or correlated color temperature CCT [K], the lamp power P [W] and the luminous efficacy [lm/W].

Lamp voltage dependencies of certain light bulb parameters, where the value at 230 V is taken as 100 %.

There is a dependency from the applied voltage. And the dependency there is, is also linear with applied lamp voltage. It indicates that the used power converter inside the lamp behaves in a stable manner

To check whether this dependency can lead to visible changes in illuminance for possible grid voltage changes, just check what variations occur when the lamp voltage varies around 230 V + and – 5 V. Then the illuminance varies between + and – 7.5 % and will not be visible or noticeable.

Warm up effects

After switch on of a cold lamp, the effect of heating up of the lamp is measured on illuminance E_v [lx], color temperature CT or correlated color temperature CCT [K], the lamp power P [W] and the luminous efficacy [lm/W].

Effect of warming up on different light bulb parameters. The first graph with the 100 % level at the beginning and the second at the end.

The lamp needs warming up. It takes about 5 minutes for the color temperature to stabilize and the light output as well.

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