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Oxxy Light Led Tube 120cm 3000K

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

oxxylightledtl120 presents a 120 cm long led tube with the name Oxxy Light. There are several variants of this tube, the warm white, the neutral white and the master food (specially for the meat industry). In this article the warm white tube.

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 3041 K warm white
Luminous intensity Iv 405 Cd Measured straight underneath the lamp
Beam angle 125 deg 125º for the C0-C180 plane (crosses the length direction of the tube), and 119º for C90-C270 plane (along the length direction of tube).
Power P 13.9 W
Power Factor 0.77 For every 1 kWh net power consumed, there has been 0.8 kVAhr for reactive power.
Luminous flux 1392 Lm
Luminous efficacy 100 Lm/W
CRI_Ra 61 Color Rendering Index.
Coordinates chromaticity diagram x=0.4253 and y=0.3857
Fitting FL-tube This tube is directly connected to the mains voltage (230V).
PAR-value 3.4 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 1.1 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 L external dimensions 30 x 1200 mm External dimensions of the tube (D = diameter). Excluding the pins.
L x W luminous area 1155 x 20 mm Dimensions of the luminous area (used in Eulumdat file). This is equal to the surface of the plate on which the leds are mounted.
General remarks The ambient temperature during the whole set of measurements was 23-25.5 deg C.

Warm up effect: during the warm up time the illuminance decreases with ≈12 % and the consumed power with ≈14 %.

Voltage dependency: the power consumption and illuminance do depend little on the voltage when it is varied from 200 – 250 V.

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

Overview table

oxxylightledtl120_3000k_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, as the distances 0.25 – 5 m are in the near field of the tube (< 5 x 1155 mm); real measured lux values will be lower than here computed.

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.

oxxylightledtl120_3000k_light_diagram

The light diagram giving the radiation pattern.

It indicates the luminous intensity around the light bulb. In the length direction (C90-C270) the beam angle is almost the same as in the direction crossing the length direction (C0-C180).

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.

oxxylightledtl120_3000k_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.

oxxylightledtl120_3000k_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 119-125º depending on the reference plane.

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 1391 Lm.

Luminous efficacy

The luminous flux being 1391 Lm, and the power of the light bulb being 13.9 W, yields a luminous efficacy of 100 Lm/W.

A power factor of 0.77 means that for every 1 kWh net power consumed, a reactive component of 0.8 kVAr was needed.

Light bulb voltage (used on power supply!) 230 VAC
Light bulb current 78 mA
Power P 13.9 W
Apparent power S 18.1 VA
Power factor 0.77

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.

oxxylightledtl120_3000k_u_i_waveforms

Voltage across and current through the lightbulb

The current does not have a sine form, but tries to approach it. The phase of the current is about the same as that of the voltage. The powerfactor is good, a bit less than 0.8.

Also the power spectrum of the current is determined.

oxxylightledtl120_3000k_powerspectrumi_percent

Squared amplitudes of higher harmonics related to the first harmonic (50 Hz).

Due to steep edges in the current, there are manu higher harmonics.

The Total Harmonic Distortion of hte current is 64 %.

Color temperature and Spectral power distribution

oxxylightledtl120_3000k_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.

oxxylightledtl120_3000k_cct_function_of_incl

Color temperature as a function of inclination angle.

The measurement of CCT is measured for inclination angles up to 75º since then the illuminance value was decreased to very low values (< 5 lux).

The beam angle is maximally 125º, meaning a 62.5º inclination angle. In this area the majority 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.

oxxylightledtl120_3000k_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

The PAR number for this light results in 3.4 μMol/s/m2. This value is valid at 1 m distance from the light bulb and valid roughly inside its beam angle.

The PAR efficiency is 63 % (valid for the PAR wave length range of 400 – 700 nm). So maximally 63 % 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.

oxxylightledtl120_3000k_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 1.1.

More info will come in a separate article.

Chromaticity diagram

oxxylightledtl120_3000k_chromaticity

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

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

Its coordinates are x=0.4253 and y=0.3857.

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.

oxxylightledtl120_3000k_cri

CRI of the light of this lightbulb.

The value of 62 is lower than 80 which is considered a minimum value for indoor usage.

Note: the chromaticity difference is 0.0059 indicates the distance to the Planckian Locus. Its value 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 light bulb parameters measured: illuminance E_v [lx], the lamppower P [W], the (Correlated) Color Temperature [K] and the luminous efficacy [Lm/W].

oxxylightledtl120_3000k_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 linearly when the voltage is varied.

When the voltage at 230 V varies with + and – 5 V, then the illuminance varies ≈ 2 %, 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], color temperature CT or correlated color temperature CCT [K], the lamppower P [W] and the luminous efficacy [lm/W].

oxxylightledtl120_3000k_startupeffect

oxxylightledtl120_3000k_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 40 minutes. During that time the illuminance decreases with ≈ 12 % and the consumed power with ≈ 14 %.

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