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Renewable Energy

Glo Dimmable 8W Mini Flood Light

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

glo_10w_and_8w_mini_floodGlo Worldwide presents a mini flood light with led chip. It’s dim-ability has not been tested. It emits warm white light.

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 2941 K Warm white
Luminous intensity Iv 95 Cd Measured straight underneath the lamp.
Illuminance modulation index 0 % Measured straight underneath the lamp. Is a measure for the amount of flickering.
Beam angle 101 deg 101º for the C0-C180-plane (crossing the length direction of the lamp, so along the smallest width of the lamp) and 98º for the C90-C270 plane (is along the longest length of the lamp).
Power P 5.3 W
Power Factor 0.72 For every 1 kWh net power consumed, there has been 1.0 kVAhr for reactive power.
THD 94 % Total Harmonic Distortion
Luminous flux 199 Lm
Luminous efficacy 38 Lm/W
CRI_Ra 71 Color Rendering Index.
Coordinates chromaticity diagram x=0.4404 and y=0.4041
Fitting 230V This lamp is connected to the 230 V grid voltage.
PAR-value 0.9 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 0.3 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 1.1 This factor indicates the amount of times more efficient the light of this light bulb is perceived under scotopic circumstances (ow environmental light level).
L x W x H external dimensions 114 x 85 x 88 mm External dimensions of the lamp. Excluding the handle.
W x L luminous area 52 x 43 mm Dimensions of the luminous area (used in Eulumdat file). This is the surface of the opening of the glassplate at the front, behind which the reflector is seated.
form factor flood light
General remarks The ambient temperature during the whole set of measurements was 26-27 deg C. The temperature of the glass plate gets 2 degrees hotter, the hottest area between the fins of the heatsink gets about 10 degrees hotter, and the side of the housing gets about 8 deg hotter than ambient.Warm up effect: during the warm up time the illuminance decreases with 20 % and the consumed power with almost 22 %.

Voltage dependency: the power consumption and illuminance was upon request not tested in a wide range.

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

Overview table

8w_dimmable_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 70 mm (diagonal length) ≈ 350 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. 8w_dimmable_light_diagram

The light diagram giving the radiation pattern.

It indicates the luminous intensity around the light bulb. The plane C90-C270 (along the length direction of the lamp) has a little wider beam than the C0-C180 (crosses the longest side of the lamp).

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.

8w_dimmable_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.

8w_dimmable_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 98-101º depending on the C-plane 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 199 Lm.

Luminous efficacy

The luminous flux being 199 Lm, and the power of the light bulb being 5.3 W, yields a luminous efficacy of 38 Lm/W.

Electrical properties

A power factor of 0.72 means that for every 1 kWh net power consumed, a reactive component of 1.0 kVAr was needed.

Lamp voltage 230 VAC
Lamp current 32 mA
Power P 5.3 W
Apparent power S 7.4 VA
Power factor 0.72

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.

8w_dimmable_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.

8w_dimmable_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 94 %.

Temperature measurements lamp

ir_0035_em078

The glassplate has an emissivity of 0.78, it gets barely warmer than ambient.

ir_0035_em095

The resulting temperature image of the side of the housing and the fins of the heatsink.

ir_0045

The temperature between the fins.


status lamp > 2 hours on
ambient temperature 26 deg C
reflected background temperature 26 deg C
camera Flir T335
emissivity 0.95
measurement distance 0.3 m (heatsink)
IFOVgeometric 0.4 mm
NETD (thermal sensitivity) 50 mK

The hottest temperature on the lamp is at the heatsink, which is warm-to-the-touch.

Color temperature and Spectral power distribution

8w_dimmable_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 2941 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.

8w_dimmable_cct_function_of_incl

Color temperature as a function of inclination angle.

The measurement of CCT is measured for inclination angles up to 55º and beyond the illuminance value gets very low (< 5 lux).

The maximum beam angle is 101º, meaning a 50.5º inclination angle. In this area most of the light is present. The variation in correlated color temperature in this area is less than 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.

8w_dimmable_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 0.9 μMol/s/m²
PAR-photon current 1.8 μMol/s
PAR-photon efficacy 0.3 μMol/s/W

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.

8w_dimmable_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 on S/P ratio can be found on the OliNo website.

Chromaticity diagram

8w_dimmable_chromaticity

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

The light coming from this lamp is on the border of the areas class A and class B. These classes are areas defined for signal lamps, see also the OliNo website.

Its coordinates are x=0.4404 and y=0.4041.

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.

8w_dimmable_cri

CRI of the light of this lightbulb.

The value of 71 is lower than 80 which is considered a minimum value for indoor usage.

Note: the chromaticity difference is 0.0005 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 not determined.

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].

8w_dimmable_startupeffect

8w_dimmable_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 20 % and the consumed power with about 22 %.

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.

8w_dimmable_flicker_waveforms

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

parameter waarde eenheid
Flicker frequency n.a. Hz
Illuminance modulation index 0 %

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

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