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BALENO Led 230 V 4 W Light Bulb E27

Posted by Marcel van der Steen in Led lights, Light measurements Add comments

2510842_e27-4w presents a spot light with E27 fitting.

This article shows the measurement results. Many parameters are also found in the Eulumdat file.

See this overview for a comparison with other light bulbs.

Summary measurement data

parameter meas. result remark
Color temperature 3062 K Warm white
Luminous intensity Iv 20 Cd Measured straight underneath the lamp
Beam angle 167 deg 167º for the all C planes as the light bulb is symmetrical over its height axis.
Power P 4.7 W Follow the link for more electrical and temperature properties.
Power Factor 0.93 For every 1 kWh net power consumed, there has been 0.4 kVAhr for reactive power.
Luminous flux 119 Lm
Luminous efficacy 25 Lm/W This result is valid for direct 12 V AC power, so without transformer.
CRI_Ra 82 Color Rendering Index.
Coordinates chromaticity diagram x=0.4299 and y=0.3977
Fitting E27
PAR-value 0.2 μMol/s/m2 The number of photons seen by an average plant when it is lit by the light of this light bulb. Value valid at 1 m distance from light bulb.
S/P ratio 1.3 This factor indicates the amount of times more efficient the light of this light bulb is perceived under scotopic circumstances (ow environmental light level).
D x H external dimensions 51 x 104 mm External dimensions of the lamp (D = diameter).
D x H luminous area 51 x 25 mm Dimensions of the luminous area (used in Eulumdat file). This is equal to the surface of area of the milk white glass.
General remarks The ambient temperature during the whole set of measurements was 23.5-25 deg C. The heat sink of the light bulb gets about 40 degrees hotter than ambient.
Warm up effect: during the warm up time the illuminance decreases 5 % and the consumed power increases 8 %.

Voltage dependency: the power consumption and illuminance vary when the voltage is varied.

Measurement report (PDF) olino-pdf
Eulumdat file olino_eulumdat Right click on icon and save the file.

Overview table

baleno_led_4w_e27_summary2

The overview table is explained on the OliNo website. Please note that this overview table makes use of calculations, use this data with care as explained on the OliNo site. E (lux) values are not accurate, when within 5 x 51 mm ≈ 250 mm. Within this distance from the lamp, the measured lux values willl be less than the computed values in this overview as the measurements are then within the near field of the lamp.

Eulumdat light diagram

This light diagram below comes from the program Qlumedit, that extracts these diagrams from an Eulumdat file. It is explained on the OliNo site.

baleno_led_4w_e27_light_diagram

The light diagram giving the radiation pattern.

It indicates the luminous intensity around the light bulb. All C-planes have the same pattern.

Illuminance Ev at 1 m distance, or luminous intensity Iv

Herewith the plot of the averaged luminous intensity Iv as a function of the inclination angle with the light bulb.

baleno_led_4w_e27_pp_avg

The radiation pattern of the light bulb.

This radiation pattern is the average of the light output of the light diagram given earlier. Also, in this graph the luminous intensity is given in Cd.

These averaged values are used (later) to compute the lumen output.

baleno_led_4w_e27_ev_dep_kantelhoek

Intensity data of every measured turn angle at each inclination angle.

This plot shows per inclination angle the intensity measurement results for each turn angle at that inclination angle. There normally are differences in illuminance values for different turn angles. However for further calculations the averaged values will be used.

When using the average values per inclination angle, the beam angle can be computed, being 167º.

Luminous flux

With the averaged illuminance data at 1 m distance, taken from the graph showing the averaged radiation pattern, it is possible to compute the luminous flux.

The result of this computation for this light spot is a luminous flux of 119 Lm.

Luminous efficacy

The luminous flux being 119 Lm, and the power of the light bulb being 4.7 W, yields a luminous efficacy of 25 Lm/W.

Electrical properties

A power factor of 0.93 means that for every 1 kWh net power consumed, a reactive component of 0.4 kVAr was needed.

Lamp voltage 230 VAC
Lamp current 22 mA
Power P 4.7 W
Apparent power S 5.0 VA
Power factor 0.93

Of this light bulb the voltage across ad the resulting current through it are measured and graphed. See the OliNo site how this is obtained.

baleno_led_4w_e27_u_i_waveforms

Voltage across and current through the lightbulb

Also the powerspectrum has been recorded.

baleno_led_4w_e27_powerspectrumi_percent

The current power spectrum, with the squared harmonics (in % of the 1st harmonic at 50 Hz)

The Total Harmonic Distortion of the current is computed as 39 %.

Temperature measurements lamp

baleno_led_4w_e27_ir

Temperature image of the light bulb

Tape is put on the heat sink, to record the temperature of the blades. Then also the temperature is measured between the blades. This is done directly as it is assumed that the emissivity of the area betwee two blades is around 0.95. This assumption is made since the temperature measured on the ribs with or without tape is the same.

status lamp > 2 hours on
ambient temperature 23 deg C
reflected background temperature 23 deg C
camera Flir B-CAM Western S
emissivity 0.95(1)
measurement distance 0.20 m
IFOVgeometric 0.7 mm
NETD (thermal sensitivity) 100 mK

(1) The emissivity of the masking tape is used which is about 0.95. The masking tape is so thin that it quickly takes the same temperature as the light bulb’s heat sink.

The temperature on its heat sink gets to about 62 deg C on the ribs and 67 deg C between them.

Color temperature and Spectral power distribution

baleno_led_4w_e27_powerspectrum_at_1m_distance

The spectral power distribution of this light bulb, energies on y-axis valid at 1 m distance.

The measured color temperature is about 3050 K which is warm white.

This color temperature is measured straight underneath the light bulb. Below a graph showing the color temperature for different inclination angles.

baleno_led_4w_e27_cct_function_of_incl

Color temperature as a function of inclination angle.

The measurement of CCT is measured for inclination angles up to 90º.

The beam angle is 167º, meaning a 83.5º inclination angle. In this area the majority of the light is present. The variation in correlated color temperature in this area is ≈ 1 %.

PAR value and PAR spectrum

To make a statement how well the light of this light bulb is for growing plants, the PAR-area needs to be determined. See the OliNo website how this all is determined and the explanation of the graph.

baleno_led_4w_e27_par_spectra_at_1m_distance

The photon spectrum, then the sensitivity curve and as result the final PAR spectrum of the light of this light bulb

parameter value unit
PAR-number 0.2 μMol/s/m²

The PAR efficiency is 64 % (valid for the PAR wave length range of 400 – 700 nm). So maximally 64 % of the total of photons in the light is effectively used by the average plant (since the plant might not take 100 % of the photons at the frequency where its relative sensitivity is 100 %).

S/P ratio

The S/P ratio and measurement is explained on the OliNo website. Here the results are given.

baleno_led_4w_e27_s_and_p_spectra_at_1m_distance
The power spectrum, sensitivity curves and resulting scotopic and photopic spectra (spectra energy content defined at 1 m distance).

The S/P ratio is 1.3.

More info on S/P ratio can be found on the OliNo website.

Chromaticity diagram

baleno_led_4w_e27_chromaticity

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

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

Its coordinates are x=0.4299 and y=0.3977.

Color Rendering Index (CRI) or also Ra

Herewith the image showing the CRI as well as how well different colors are represented (rendered). 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). Practical information and also some critics about the CRI can be found on the OliNo website.

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.

baleno_led_4w_e27_cri

CRI of the light of this lightbulb.

The value of 82 is the higher than 80 which is considered a minimum value for indoor usage.

Note: the chromaticity difference is 0.0016 indicates the distance to the Planckian Locus. There is no norm yet that states what the max deviation from white light is allowed to be.

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 light bulb parameters measured: illuminance E_v [lx], the lamppower P [W], the (Correlated) Color Temperature [K] and the luminous efficacy [Lm/W].

baleno_led_4w_e27_voltagedependency

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

The illuminance and consumed power do vary when the voltage is varied widely. The variation is not linear.

When the voltage at 230 V varies with + and – 5 V, then the illuminance varies 5 %, when abrupt voltage changes occur this effect is probably not visible in the illuminance output.

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 lamppower P [W] and the luminous efficacy [lm/W].

baleno_led_4w_e27_startupeffect

baleno_led_4w_e27_startupeffect_end

Effect of warming up on different light bulb parameters. At top the 100 % level is put at begin, and at bottom at the end.

The warm up time is about 30 minutes. During that time the illuminance decreases with 5 % and the consumed power increases with 8 %.

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