{"id":4604,"date":"2010-02-10T03:19:29","date_gmt":"2010-02-10T08:19:29","guid":{"rendered":"http:\/\/www.olino.org\/us\/?p=4604"},"modified":"2010-02-10T03:53:26","modified_gmt":"2010-02-10T08:53:26","slug":"loko-led-tube-light-60-cm","status":"publish","type":"post","link":"https:\/\/olino.org\/blog\/us\/articles\/2010\/02\/10\/loko-led-tube-light-60-cm\/","title":{"rendered":"Loko Led Tube light 60 cm"},"content":{"rendered":"

\"loko_ledtl\"<\/a> presents a 60 cm long led tube light. The tube has smd leds and emits a cold white light. Also exist the 120 cm version (cold white) and 150 cm version (neutral white).<\/p>\n

This article shows the measurement results. Many parameters are also found in the Eulumdat file<\/a>.<\/p>\n

See this overview<\/a> for a comparison with other light bulbs.<\/p>\n

<\/p>\n

Summary measurement data<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
parameter<\/th>\nmeas. result<\/th>\nremark<\/th>\n<\/tr>\n
Color temperature<\/a><\/td>\n3522 K<\/td>\nWarm white (cold side of warm white)<\/td>\n<\/tr>\n
Luminous intensity Iv<\/sub><\/a><\/td>\n265 Cd<\/td>\nMeasured straight underneath the lamp<\/td>\n<\/tr>\n
Beam angle<\/a><\/td>\n115 deg<\/td>\n115\u00ba for the C0-C180 plane<\/a> (crosses the length direction of the tube), and 109\u00ba for C90-C270 plane (along the length direction of tube).<\/td>\n<\/tr>\n
Power P<\/a><\/td>\n9.6 W<\/td>\nFollow the link for more electrical and temperature properties.<\/td>\n<\/tr>\n
Power Factor<\/a><\/td>\n0.91<\/td>\nFor every 1 kWh net power consumed, there has been 0.5 kVAhr for reactive power.<\/td>\n<\/tr>\n
Luminous flux<\/a><\/td>\n777 Lm<\/td>\n<\/td>\n<\/tr>\n
Luminous efficacy<\/a><\/td>\n81 Lm\/W<\/td>\n<\/td>\n<\/tr>\n
CRI_Ra<\/a><\/td>\n67<\/td>\nColor Rendering Index<\/a>.<\/td>\n<\/tr>\n
Coordinates chromaticity diagram<\/a><\/td>\nx=0.4050 and y=0.3944<\/td>\n<\/td>\n<\/tr>\n
Fitting<\/td>\nFL-tube<\/a><\/td>\nThis tube is connected directly to the 230 V grid.<\/td>\n<\/tr>\n
PAR-value<\/a><\/td>\n2.1 \u03bcMol\/s\/m2<\/sup><\/td>\nThe 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.<\/td>\n<\/tr>\n
PAR-photon efficacy<\/a><\/td>\n0.7 \u03bcMol\/s\/We<\/sub><\/td>\nThe toal emitted number of photons by this light, divided by its consumption in W. It indicates a kind of efficacy in generating photons.<\/td>\n<\/tr>\n
S\/P ratio<\/a><\/td>\n1.3<\/td>\nThis factor indicates the amount of times more efficient the light of this light bulb is perceived under scotopic circumstances (ow environmental light level).<\/td>\n<\/tr>\n
D x L external dimensions<\/td>\n29 x 588 mm<\/td>\nExternal dimensions of the lamp (D = diameter, L = Length without pins).<\/td>\n<\/tr>\n
L x W luminous area<\/td>\n565 x 24 mm<\/td>\nDimensions of the luminous area (used in Eulumdat file). This is equal to the surface of area on which the leds are mounted.<\/td>\n<\/tr>\n
General remarks<\/td>\n<\/td>\nThe ambient temperature during the whole set of measurements was 23-24.5 deg C. The maximum temperature of the tube light gets about 16 degrees hotter<\/a> than ambient.
\nWarm up effect<\/a>: during the warm up time the illuminance decreases with 7 % and the consumed power with 5 %.<\/p>\n

Voltage dependency<\/a>: the power consumption and illuminance do not significantly depend on the voltage when it is varied from 200 – 250 V.<\/td>\n<\/tr>\n

Measurement report (PDF)<\/td>\n\"olino-pdf\"<\/a><\/td>\n<\/td>\n<\/tr>\n
Eulumdat file<\/td>\n\"olino_eulumdat\"<\/a><\/td>\nRight click on icon and save the file.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Overview table<\/h3>\n

\"loko_ledtl_060cm_summary2\"<\/a><\/p>\n

The overview table<\/a> 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 565 mm \u2248 2800 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.<\/p>\n

<\/a>Eulumdat light diagram<\/h3>\n

This light diagram below comes from the program Qlumedit<\/a>, that extracts these diagrams from an Eulumdat<\/a> file. It is explained<\/a> on the OliNo site.<\/p>\n

\"loko_ledtl_060cm_light_diagram\"<\/a><\/p>\n

The light diagram giving the radiation pattern.<\/em><\/p>\n

It indicates the luminous intensity around the light bulb. The direction C90-C270 has a beam comparable to that of the C0-C180 plane.<\/p>\n

Illuminance Ev at 1 m distance, or luminous intensity Iv<\/h3>\n

Herewith the plot of the averaged<\/em> luminous intensity Iv as a function of the inclination angle with the light bulb.<\/p>\n

\"loko_ledtl_060cm_pp_avg\"<\/a><\/p>\n

The radiation pattern<\/a> of the light bulb.<\/em><\/p>\n

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.<\/p>\n

These averaged values are used (later) to compute the lumen output.<\/p>\n

<\/a><\/p>\n

\"loko_ledtl_060cm_ev_dep_kantelhoek\"<\/a><\/p>\n

Intensity data of every measured turn angle at each inclination angle.<\/em><\/p>\n

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.<\/p>\n

When using the average values per inclination angle, the beam angle<\/a> can be computed, being 115\u00ba for the C0-C180 plane (crossing the length direction) and 109\u00ba in the C90-C270 plane (along the length direction).<\/p>\n

Luminous flux<\/a><\/h3>\n

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<\/a>.<\/p>\n

The result of this computation for this light spot is a luminous flux of 777 Lm.<\/p>\n

Luminous efficacy<\/a><\/h3>\n

The luminous flux being 777 Lm, and the power of the light bulb being 9.6 W, yields a luminous efficacy of 81 Lm\/W.<\/p>\n

Electrical properties<\/a><\/h3>\n

A power factor of 0.91 means that for every 1 kWh net power consumed, a reactive component of 0.5 kVAr was needed.<\/p>\n\n\n\n\n\n\n\n
Lamp voltage<\/td>\n230 VAC<\/td>\n<\/tr>\n
Lamp current<\/td>\n46 mA<\/td>\n<\/tr>\n
Power P<\/td>\n9.6 W<\/td>\n<\/tr>\n
Apparent power<\/a> S<\/td>\n10.6 VA<\/td>\n<\/tr>\n
Power factor<\/a><\/td>\n0.91<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Of this light bulb the voltage across ad the resulting current through it are measured and graphed. See the OliNo site<\/a> how this is obtained.<\/p>\n

\"loko_ledtl_060cm_u_i_waveforms\"<\/a><\/p>\n

Voltage across and current through the lightbulb<\/em><\/p>\n

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<\/a>.<\/p>\n

\"loko_ledtl_060cm_harmonics\"<\/a><\/p>\n

Harmonics in in the current waveform and checked against IEC61000-3-2:2006<\/em><\/p>\n

There are no limits for the harmonics for led lighting equipment <= 25 W.<\/p>\n

The Total Harmonic Distortion of the current is computed as 20 %.<\/p>\n

Temperature measurements lamp<\/a><\/h3>\n

\"ir_0307\"<\/a><\/p>\n

Overview, look for the hotspots<\/em><\/p>\n

\"ir_0310\"<\/a><\/em><\/em><\/a>\"ir_0311\"<\/a><\/em><\/p>\n

<\/em><\/em><\/p>\n

The warmest position on the metal heat sink, measured on a piece of masking tape
\n<\/em><\/p>\n\n\n\n\n\n\n\n\n\n\n
status lamp<\/td>\n> 2 hours on<\/td>\n<\/tr>\n
ambient temperature<\/td>\n24 deg C<\/td>\n<\/tr>\n
reflected background temperature<\/td>\n24 deg C<\/td>\n<\/tr>\n
camera<\/td>\nFlir BCAM<\/td>\n<\/tr>\n
emissivity<\/td>\n0.95(1)<\/sup><\/td>\n<\/tr>\n
measurement distance<\/td>\n0.10 m (closest zoom)<\/td>\n<\/tr>\n
IFOVgeometric<\/sub><\/td>\n0.4 mm<\/td>\n<\/tr>\n
NETD (thermal sensitivity)<\/td>\n100 mK<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

(1)<\/sup> 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.<\/p>\n

The tube on its hotttest side gets warm-to-the-touch, being 40 deg C.<\/p>\n

Color temperature and Spectral power distribution<\/a><\/h3>\n

\"loko_ledtl_060cm_powerspectrum_at_1m_distance\"<\/a><\/p>\n

The spectral power distribution of this light bulb, energies on y-axis valid at 1 m distance.<\/em><\/p>\n

The measured color temperature is about 3525 K which is warm white (to the cold side of the warm white region).<\/p>\n

This color temperature is measured straight underneath the light bulb. Below a graph showing the color temperature for different inclination angles.<\/p>\n

\"loko_ledtl_060cm_cct_function_of_incl\"<\/a><\/p>\n

Color temperature as a function of inclination angle.<\/em><\/p>\n

The measurement of CCT is measured for inclination angles up to 75\u00ba since then the illuminance value was decreased to very low values (< 5 lux).<\/p>\n

The beam angle for the C0-C180 is 115\u00ba, meaning a 58.5\u00ba inclination angle. In this area the majority of the light is present. The variation in correlated color temperature in this area is \u2248 3 %.<\/p>\n

PAR value and PAR spectrum<\/a><\/h3>\n

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 <\/a>how this all is determined and the explanation of the graph.<\/p>\n

\"loko_ledtl_060cm_par_spectra_at_1m_distance\"<\/a><\/p>\n

The photon spectrum, then the sensitivity curve and as result the final PAR spectrum of the light of this light bulb<\/em><\/p>\n\n\n\n\n\n\n
parameter<\/th>\nvalue<\/th>\nunit<\/th>\n<\/tr>\n
PAR-number<\/td>\n2.1<\/td>\n\u03bcMol\/s\/m\u00b2<\/td>\n<\/tr>\n
PAR-photon current<\/td>\n6.3<\/td>\n\u03bcMol\/s<\/td>\n<\/tr>\n
PAR-photon efficacy<\/td>\n0.7<\/td>\n\u03bcMol\/s\/W<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The PAR efficiency is 62 % (valid for the PAR wave length range of 400 – 700 nm). So maximally 62 % 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 %).<\/p>\n

S\/P ratio<\/a><\/h3>\n

The S\/P ratio and measurement is explained on the OliNo website<\/a>. Here the results are given.<\/p>\n

\"loko_ledtl_060cm_s_and_p_spectra_at_1m_distance\"<\/a>
\nThe power spectrum, sensitivity curves and resulting scotopic and photopic spectra (spectra energy content defined at 1 m distance).<\/em><\/p>\n

The S\/P ratio is 1.3.<\/p>\n

More info on S\/P ratio can be found on the OliNo website<\/a>.<\/p>\n

Chromaticity diagram<\/a><\/h3>\n

\"loko_ledtl_060cm_chromaticity\"<\/a><\/p>\n

The chromaticity space<\/a> and the position of the lamp’s color coordinates in it.<\/em><\/p>\n

The light coming from this lamp is close at the Planckian Locus<\/a> (the black path in the graph).<\/p>\n

Its coordinates are x=0.4050 and y=0.3944.<\/p>\n

Color Rendering Index (CRI) or also Ra<\/a><\/h3>\n

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<\/a>.<\/p>\n

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.<\/p>\n

\"loko_ledtl_060cm_cri\"<\/a><\/p>\n

CRI of the light of this lightbulb.<\/em><\/p>\n

The value of 67 is lower than 80 which is considered a minimum value for indoor usage.<\/p>\n

Note: the chromaticity difference is 0.0018 indicates the distance to the Planckian Locus<\/a>. There is no norm yet that states what the max deviation from white light is allowed to be.<\/p>\n

Voltage dependency<\/a><\/h3>\n

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].<\/p>\n

\"loko_ledtl_060cm_voltagedependency\"<\/a><\/p>\n

Lamp voltage dependencies of certain light bulb parameters, where the value at 230 V is taken as 100 %.<\/em><\/p>\n

The illuminance and consumed power do not (significantly) vary when the voltage is varied, in a linear matter.<\/p>\n

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.<\/p>\n

Warm up effects<\/a><\/h3>\n

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].<\/p>\n

\"loko_ledtl_060cm_startupeffect\"<\/a><\/p>\n

\"loko_ledtl_060cm_startupeffect_end\"<\/a><\/p>\n

Effect of warming up on different light bulb parameters. At top the 100 % level is put at begin, and at bottom at the end.<\/em><\/p>\n

The warm up time is about 35 minutes. During that time the illuminance decreases 7 % and the consumed power with 5 %.<\/p>\n","protected":false},"excerpt":{"rendered":"

presents a 60 cm long led tube light. The tube has smd leds and emits a cold white light. Also exist the 120 cm version (cold white) and 150 cm version (neutral white). This article shows the measurement results. Many parameters are also found in the Eulumdat file. See this overview for a comparison with […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[7,20],"tags":[],"_links":{"self":[{"href":"https:\/\/olino.org\/blog\/us\/wp-json\/wp\/v2\/posts\/4604"}],"collection":[{"href":"https:\/\/olino.org\/blog\/us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/olino.org\/blog\/us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/olino.org\/blog\/us\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/olino.org\/blog\/us\/wp-json\/wp\/v2\/comments?post=4604"}],"version-history":[{"count":4,"href":"https:\/\/olino.org\/blog\/us\/wp-json\/wp\/v2\/posts\/4604\/revisions"}],"predecessor-version":[{"id":4611,"href":"https:\/\/olino.org\/blog\/us\/wp-json\/wp\/v2\/posts\/4604\/revisions\/4611"}],"wp:attachment":[{"href":"https:\/\/olino.org\/blog\/us\/wp-json\/wp\/v2\/media?parent=4604"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/olino.org\/blog\/us\/wp-json\/wp\/v2\/categories?post=4604"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/olino.org\/blog\/us\/wp-json\/wp\/v2\/tags?post=4604"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}