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Renewable Energy

LUMOluce – L04180WW Down Lighter Luan 2

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

lumotech_luan2_ww presents a led down lighter that emits white light. The used cooling is done via pipes at the bottom of the area where the led(s) is/are mounted.

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 3087 K Warm white
Luminous intensity Iv 696 Cd Measured straight underneath the lamp.
Illuminance modulation index 12 % Measured straight underneath the lamp. Is a measure for the amount of flickering.
Beam angle 91 deg 91º for all C-planes since the lamp is symmetrical along its 1st axis.
Power P 24.5 W
Power Factor 0.96 For every 1 kWh net power consumed, there has been 0.3 kVAhr for reactive power.
THD 14 % Total Harmonic Distortion
Luminous flux 1489 Lm
Luminous efficacy 61 Lm/W
CRI_Ra 83 Color Rendering Index.
Coordinates chromaticity diagram x=0.4272 and y=0.3950
Fitting 230V This lamp is connected to the 230 V grid voltage.
PAR-value 6.7 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.
PAR-photon efficacy 0.6 μMol/s/We The toal emitted number of photons by this light, divided by its consumption in W. It indicates a kind of efficacy in generating photons.
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 (low environmental light level).
D x H external dimensions 171 x 138 mm External dimensions of the lamp.
D luminous area 137 mm Dimensions of the luminous area (used in Eulumdat file). This is the surface of the milky white diffusor plate at the front of the lamp.
General remarks The ambient temperature during the whole set of measurements was 26-27 deg C. The temperature of the housing at the back side gets about 20 degrees hotter than ambient temperature. The tubes itself and the space between gets 25 deg C warmer.
Warm up effect: during the warm up time the illuminance decreases with 7 % and the consumed power with 4 %.

Voltage dependency: the power consumption and illuminance vary insignificantly when the power voltage varies between 200-250 V.

At the end of the article an additional photo is given of the driver used.

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

Overview table

lumotech_luan2_ww_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 137 mm ≈ 700 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.

lumotech_luan2_ww_light_diagram

The light diagram giving the radiation pattern.

It indicates the luminous intensity around the light bulb. All the planes give the same results as the lamp is symmetrical along its 1st axis.

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.

lumotech_luan2_ww_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.

lumotech_luan2_ww_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 91º for all C-planes looked at.

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 1489 Lm.

Luminous efficacy

The luminous flux being 1489 Lm, and the power of the light bulb being 24.5 W, yields a luminous efficacy of 61 Lm/W.

Electrical properties

A power factor of 0.96 means that for every 1 kWh net power consumed, a reactive component of 0.3 kVAr was needed.

Lamp voltage 230 VAC
Lamp current 111 mA
Power P 24.5 W
Apparent power S 25.4 VA
Power factor 0.96

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.

lumotech_luan2_ww_u_i_waveforms

Voltage across and current through the lightbulb

This waveforms have been checked on requirements posed by the norm IEC 61000-3-2:2006 (including up to A2:2009). See also the explanation on the OliNo website.

lumotech_luan2_ww_harmonics

Harmonics in in the current waveform and checked against IEC61000-3-2:2006

There are no limits for the harmonics for lighting equipment <= 25 W.

The Total Harmonic Distortion of the current is computed as 14 %.

Temperature measurements lamp

ir_0380_emm095nok

The side of the lamp has an emissivity of less than 0.95.

ir_0380_emm089

After setting the correct emissivity herewith the correct temperature image (emm = 0.89). Valid for the side of the lamp.

ir_0381

Hottest point on the lamp, between the tubes.

ir_0383

Temperature on the front plate, emissivity about 0.95.

ir_0385

The temperature of the driver.

status lamp > 2 hours on
ambient temperature 26 deg C
reflected background temperature 26 deg C
camera Flir T335
emissivity 0.89 and 0.95(1)
measurement distance 0.3 m
IFOVgeometric 0.5 mm
NETD (thermal sensitivity) 50 mK

(1) See text for explanation.

Color temperature and Spectral power distribution

lumotech_luan2_ww_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 3075 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.

lumotech_luan2_ww_cct_function_of_incl

Color temperature as a function of inclination angle.

The measurement of CCT is measured for inclination angles up to 85º. Beyond that angle the illuminance was very low (< 5 lux).

The beam angle is 91º, meaning a 45.5º inclination angle. In this area most of the light is present. The variation in correlated color temperature in this area is about 2 %.

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.

lumotech_luan2_ww_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 6.7 μMol/s/m²
PAR-photon current 14.3 μMol/s
PAR-photon efficacy 0.6 μMol/s/W

The PAR efficiency is 65 % (valid for the PAR wave length range of 400 – 700 nm). So maximally 65 % 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.

lumotech_luan2_ww_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

lumotech_luan2_ww_chromaticity

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

The light coming from this lamp is inside the area designated with class A. This class A is an area that is defined for signal lamps, see also the OliNo website.

Its coordinates are x=0.4272 and y=0.3950.

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.

lumotech_luan2_ww_cri

CRI of the light of this lightbulb.

The value of 83 is higher than 80 which is considered a minimum value for indoor usage.

Note: the chromaticity difference is 0.0023 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. A reference with signal lights as a reference is given in the chromaticity diagram.

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] and the luminous efficacy [Lm/W].

lumotech_luan2_ww_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 not vary significantly when the voltage is varied.

When the voltage at 230 V varies with + and – 5 V, then the illuminance varies < 0.1 %, so when abrupt voltage changes occur this effect is 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], the lamppower P [W] and the luminous efficacy [lm/W].

lumotech_luan2_ww_startupeffect

lumotech_luan2_ww_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 50 minutes during which the illuminance decrceases with 7 % and the consumed power with 4 %.

Measure of flickering

An analysis is done on the measure of flickering of the light output by this light bulb. See the OliNo site for more information.

lumotech_luan2_ww_flicker_waveforms

The measure of fast illuminance variartion of the light of the light bulb

parameter waarde eenheid
Flicker frequency 100 Hz
Illuminance modulation index 12 %

The illuminance modulation index is computed as: (max_Ev – min_Ev) / (max_Ev + min_Ev).

Additional photo

lumotech_driver_l05044
The used driver for the lamp.

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