presents an led tube. The measurements from OliNo show that the lamp emits a warm white light with a color temperature of 2966 K. The lamp consumes 36.7 W and has a luminous flux of 3618 lm. This results in an efficacy of 98 lm/W. The lamps energy category label is A+.

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	2966 K	warm white
Luminous intensity Iv	1203.0 Cd	Measured straight underneath the lamp.
Illuminance modulation index	1 %	Measured with a light sensor looking at the lamp (angle not defined). Is a measure for the amount of flickering.
Beam angle	115 deg	115 deg is the beam angle for the C0-C180-plane (perpendicular to the length direction of the lamp) and 108 deg is the beam angle for the C90-C270 plane, which is along the length direction of the lamp.
Power P	36.7 W	Follow the link for more information on electrical properties.
Power Factor	1.00	The tests were done with a DC power supply. This results in no blind power and as a result the power factor is always 1.0 but not relevant to mention.
THD	NaN %	Total Harmonic Distortion, is not present as a DC voltage was used to power the lamp so a DC current resulted which has no THD.
Luminous flux	3618 lm
Luminous efficacy	98 lm/W	Be aware that a DC power supply has been used. The found efficacy with this measurement is excluding the power supply that normally is needed to convert the grid voltage (230 V AC) to the used DC voltage. By excluding the consumption of the power supply the efficay found here is higher than it would be when the power supply had been included.
EU2013-label classification	A+	The energy class, from A++ (more efficient) to E (least efficient). This label is an update of the previous version, and compulsory from Sept 2013.
CRI_Ra	82	Color Rendering Index.
Coordinates chromaticity diagram	x=0.4393 en y=0.4051
Fitting	FL-tube	This tube has been connected to 29 V DC.
PAR-value	11.1 uMol/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	0.9 uMol/s/We	The total emitted number of photons by this light, divided by its consumption in W. It indicates a kind of efficacy in generating photons.
Photon current	55.6 uMol/s	The total number of photons in the light of this lamp.
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).
L x W x H external dimensions	1450 mm x 28 mm x 28 mm	External dimensions of the lamp.
L x W x H luminous area	1400 mm x 22 mm x 6 mm	Dimensions of the luminous area (used in Eulumdat file). It is the surface of the prismatic cover.
General remarks		The ambient temperature during the whole set of illuminance measurements was 24.0 – 26.0 deg C. The temperature of the housing gets maximally about 22 degrees hotter than ambient temperature. Warm up effect: During the warmup time the illuminance varies during 8 minutes and increases with 7 %. During the warmup time the power varies during 14 minutes and increases with 19 %. the variation in efficacy during the warming up is -12 %. A very high negative value indicates a significant decrease for instance due to heating up of the lamp (decrease of lifetime). Voltage dependency: There is a constant dependency of the illuminance when the power voltage varies between 26.7 – 29.5 V. There is a constant dependency of the consumed power when the power voltage varies between 26.7 – 29.5 V.
Eff-variation	-12 %	This is the variation in efficacy during the warming up. A very high negative value indicates a significant decrease for instance due to heating up of the lamp (decrease of lifetime).
Dimmable	no	Info from manufacturer.
Biologic effect factor	0.350	According to pre-norm DIN V 5031-100:2009-06.
Blue Light Hazard risk group	0	0=exempt, 1=low, 2 = moderate, 3=high risk.
form factor	tube
Eulumdat file		Right click on icon and save the file.

Overview table

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 1400 mm (maximal luminous size, eventually diagonally measured)= 7000 mm. Within this distance from the lamp (data given in red), the measured lux values will be less than the computed values in this overview as the measurements are then within the near field of the lamp.

EU 2013 Energy label classification

Since Sept 2013 these labels will be needed, see also this page for the explanation.

Important for the energy classification are the corrected rated power and the useful luminous flux.
The measured rated power is 36.7 W and might need to be corrected. The correction is dependent from the lamp type and whether or not the lamp control gear is included or not. The choice for this lamp is the following classification: Lamps operating on external LED lamp control gear. As a result the corrected rated power becomes: 40.4 W.
The luminous flux measured is 3618 lm. The classification of this lamp needed to determine the useful flux is: Non-directional lamps. Then the useful flux becomes 3618 lm. Now a reference power can be calculated.

The energy efficiency coefficient is P_corr / P_ref = 0.15.

EU energy label for this lamp

Zip file with 6 EU energy labels of this lamp

The lamp’s performance in the lumen-Watt field, with the energy efficacy fields indicated.

Eulumdat light diagram

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

The light diagram giving the radiation pattern.

The light diagram indicates the beam in the C0-C180 plane (perpendicular to the length direction of the lamp) and in the plane perpendicular to that, the C90-C270 plane (along the length direction 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.

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.

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 115 deg for the C0-C180 plane and 108 deg for the C90-C270 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 3618 lm.

Luminous efficacy

The luminous flux being 3618 lm, and the consumed power of the lamp being 36.7 Watt, results in a luminous efficacy of 98 lm/Watt.

Electrical properties

The power factor is 1.00. The tests were done with a DC power supply. This results in no blind power and as a result the power factor is always 1.0 but not relevant to mention.

Lamp voltage	29.08 V
Lamp current	1.264 A
Power P	36.7 W
Apparent power S	36.7 VA
Power factor	1.00

Temperature measurements lamp

Temperature image(s).

status lamp	> 2 hours on
ambient temperature	25 deg C
reflected background temperature	25 deg C
camera	Flir T335
emissivity	0.95
measurement distance	1 m
IFOVgeometric	0.136 mm per 0.1 m distance
NETD (thermal sensitivity)	50 mK

Color temperature and Spectral power distribution

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

The measured color temperature is 2966 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.

Color temperature as a function of inclination angle.

The color temperature is given for inclination angles up to 80 deg. Beyond that value the illuminance is so low (< 5 lux) that it has not been used for color determination of the light.

For the C0-C180 plane: the beam angle of 115 deg is equivalent to 57.5 deg inclination angle,which is the area where most of the light falls within. The maximum variation of color temperature in this inclination area is about 2 %.

For the C90-C270 plane: the beam angle of 108 deg is equivalent to 53.8 deg inclination angle,which is the area where most of the light falls within. The maximum variation of color temperature in this inclination 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 explanation about PAR on the OliNo website how this all is determined and the explanation of the graph.

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	11.1	uMol/s/m^2
PAR photon current	33.4	uMol/s
PAR photon efficacy	0.9	uMol/s/W

The PAR efficiency is 64 % (valid for the PAR wave length range of 400 – 700 nm). This is the maximum percentage of the total of photons in the light that 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.

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

The S/P ratio of the light coming from this lamp is 1.3.

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

Chromaticity diagram

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

The point of the light in this diagram is on the border of the areas A and B. These areas indicate areas for signal lamps, see also the article on signal lamps and color areas on the OliNo website.

The color coordinates are x=0.4393 and y=0.4051.

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.

CRI of the light of this lightbulb.

This value of 82 indicates how well the light of this lamp can render well a set of reference colors, this in comparison with the light of a reference source (for color temperatures < 5000K a black radiator is used as reference and for color temperatures > 5000K the sun or the light outside during the day).

The value of 82 is bigger than the value of 80 that is considered as a minimum for working areas in general.

Note: the chromaticity difference is 0.0003 and indicates the distance to the Planckian Locus. There is a value mentioned of max 5.4E-3 in section 5.3 of CIE 13.3-1995 however not further explanation of it.
An other 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] (this latter is estimated here by dividing the found E_v value by P).

Lamp voltage dependencies of certain light bulb parameters

There is a constant dependency of the illuminance when the power voltage varies between 26.7 – 29.5 V.
There is a constant dependency of the consumed power when the power voltage varies between 26.7 – 29.5 V.

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].

Effect of warming up on different light bulb parameters. In the first graph the 100 % level is put at begin, and in the last graph the 100 % level is put at the end.

During the warmup time the illuminance varies during 8 minutes and increases with 7 %.
During the warmup time the power varies during 14 minutes and increases with 19 %.
the variation in efficacy during the warming up is -12 %. A very high negative value indicates a significant decrease for instance due to heating up of the lamp (decrease of lifetime).

Measure of flickering

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

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

parameter	value	unit
Flicker frequency	60.6	Hz
Illuminance modulation index	1	%

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

Biologic effect

The biologic effect shows the level of impact the light of this lamp can have on the day-night rhythm of human beings (as well as the suppression of melatonin production). See also the explanatory article on biologic effect on OliNo.
The important parameters (according to prenorm DIN V 5031-100:2009-06):

biologic effect factor	0.350
kbiol trans (25 years)	1.000
kbiol trans (50 years)	0.763
kbiol trans (75 years)	0.506
kpupil(25 years)	1.000
kpupil(50 years)	0.740
kpupil(75 years)	0.519

Blue Light Hazard

The amount of blue light and the harm it can cause on the retina has been determined. Herewith the results.
See for more info the explanation about blue light hazard on the OliNo site.

The level of blue light of this lamp related to the exposure limit and the different classification areas.

L_lum0 [mm]	15	Dimension of brightest part of lamp in C0-C180 direction.
L_lum90 [mm]	900	Dimension of brightest part of lamp in C90-C270 direction.
SSD_500lx [mm]	1551	Calculated distance where Ev = 500 lux. This computation is valid when it is in the far field of the lamp. Note: if this value < 200 mm then the distance of 200 mm is taken as proposed in the norm IEC 62471:2006.
Start of far field [mm]	4501	Minimum distance at which the lamp can be seen as apoint source. In this area the Ev is linearly dependent from (1/distance)2.
300-350 nm values stuffed with 0s	yes	In the event OliNo has measured with a SpB1211 spectrometer without UV option then the irradiance data of 300-349 nm is missing. For lamps where there is already no energy content near 350 nm, the values 300-349 can also be set at zero then.
alphaC0-C180 [rad]	0.010	(Apparent) source angle in C0-C180 direction.
alphaC90-C270 [rad]	0.580	(Apparent) source angle in C90-C270 direction.
alphaAVG [rad]	0.055	Average (apparent) source angle. If average >= 0.011 rad then the exposure limit is computed with radiance Lb. Otherwise with irradiance Eb.
Exposure value [W/m^2/sr]	<1.14E+1	Blue Light Hazard value for this lamp, measured straight underneath the lamp. Computation is referenced to Lb. Because the distance at 500 lux is in the near field, then this exposure value is too pessimistic and should be lower.
Blue Light Hazard risk group	0	0=exempt, 1=low, 2 = moderate, 3=high risk.