The LED “Bulb” with Hidden Talents

If you ever wanted to have an E27 LED bulb, which you three light colors can – elicit as needed without Smartphone and app, with a normal wall switch: the “Varilux 3-in-1” by LightMe for almost 20 euros would be a good choice, as my test and the laboratory measurements show.

Flexible controllable LED lights are becoming increasingly popular. There’s them as parts of a complex lighting control system, as app-driven “island solutions”, with relatively simple infrared or radio remote control and – yet simple: with integrated electronics that may regulate brightness and/or light color by simple wall dimmer- or serial switching commands. It has the invaluable advantage that the existing electrical installation remains intact and no additional control units or “Gateways”are necessary for the user.

Smartphones and pads may take a break; even children and the elderly are not overwhelmed by the LightingHowto. The MegaMan parent company IDV GmbH in Langenselbold should have thought those as they Round 20 euro expensive, produced in the people’s Republic of China “Varilux 3-in-1″ lamp new in the range of affordable consumer brand”LightMe” recorded.

At first glance, she looks so harmless from how many ordinary E27 -LED Retrofits – no sign of “High-tech” (picture on the right): Silver screw base, light white, smooth cast aluminum housing without cooling fins or openings, matte plastic cover – ready. The maximum width of 6 cm and less than 12 cm long “bulb” that can light up at least as bright as a traditional 60-watt incandescent bulb weighs 105 grams.

When you first turn it will “Warm white”

This comparison but only for the part is really correct, because he stands only for one-third of the possibilities of this ‘ Varilux ‘ model. According to packing density and light print (Detail pictured left) to which a range of 750 to 960 lumen luminous flux cover – depending on the setting of the colour temperature.

The lowest brightness produced after the first turn.Then she lights up “warm white” with approximately 2700 Kelvin. If you off again within less than five seconds and turn, it switches immediately to “Daylight” or “Cool white” with significantly more power. The repetition of this procedure provides a synthesis of two types of LED: “Neutral white”, about 4000 Kelvin.

The lamp keeps track of the last light color

A memory function ensures that the light colour selected last is stored after more than five seconds even when a power failure operation or when you turn the lamp out of the socket. The next time the “Varilux” lights exactly as before. You can synchronously control also a whole battery of these lamps with a single wall switch and generate the same light color throughout the room. Mixtures of any kind are of course also possible, if you need, for example, in a (work) corner “colder” light than in the other.

You need not worry about “Timelag”-, heat – and noise problems: in my open, hanging test version launched the lamp with 0.5 seconds delay, was warm maximum of 69 degrees after two hours at the hottest spot near the base (in “Neutral white” at the bottom of the hood remained at around 25°) and caused only a slight whirring, which was audible in quiet surroundings in no more than 5 cm distance.

Some more Watts than specified

The power consumption was according to my amateur-meter when all light colors in a range between 10.3 and 11 Watt electric power factor of 0.54. The Pro Lab of my cooperation partner “David communication” calculated values of 10.46 up 11.54 at factor 0.55 or 0.56. The measurement differences are so minimal, but all have a nominal value of smooth 10 Watt (see packet data and EU eco-label below).

The “Varilux” is therefore actually less effective than advertised and the second best efficiency class A + wrong? No. Because in the Integrating sphere collected flux was also in all three settings higher than promised by “LightMe”: 825 lumens at “Warm white” and 2715 Kelvin (Pdf download of the test protocol), good 970 lm with “Cool white” (pdf Download) and 6322 K approximately 982 lm for “Neutral white” and 4041 K(Download pdf).

Color temperature is my clear favorite

Especially the latter does appear in practice at least as bright you such as a 75-watt incandescent bulb and was my personal favorite setting also for one other aspect: light colour and colour fidelity seemed to be my most favorite here. Look on the default reference images with the deep blue and the site model motorcycle against a white background (white balance “daylight”, without editing, for larger image click on):

Actually wanted to play the lamp in the laboratory in a completely different League when she was allowed to shine “Neutral white”: instead of the nominal color rendering index CRI > 80 somewhere in the lower LED midfield to go stale, she trumped up with RA 87 and put additional measuring colors “Skin color pink” (92.3 = R13) and “Yellow saturated” (R = 93.1) top values. Even the most problematic LED challenge “saturated red” (R9 = 32.1) mastered the “Varilux 3-in-1” with flying colors.

This performance left the two other settings slightly pale look: RA 82.5 and R9 = 9.9 at “Warm white”; RA 82.9 and R9 = 7.0 at “Cool white”. Within the trio of spectral diagrams- the radiation power in milliwatts per nanometre wavelength – “Neutral white” makes consequently also strangled out impression:

Field angle is not equal to half value angle

There is no significant difference between the three options in terms of angle. It is specified by “LightMe” on the packaging very teasingly with “Field angle 300 ° Rotary Beeding” (see section above). This field angle has but little to do with the famous half-value angle, but referred to the solid angle is measured within its only at least 10 (instead of 50) percent of the maximum luminous intensity. My “neutral white” light picture shows how it is easy to understand:

This is down significantly brighter than the down towards the base to the top and to the sides – a perfect round Spotlight looks different. The half value angle of about 175 degrees, measured by the laboratory confirmed this observation (Download pdf of the diagram).

The color temperature for the assessment of the stability of the light is also matter. In the camera display a flickering was observed at any setting. The”Flicker Tester” app “Viso systems” attested a 0.0 index and only 4% flicker rate at a reference frequency of 100 Hz. It isn’t much better.

The nominal lifetime of at least 20,000 hours of light and about 40,000 cycles, which can be read, not only on the packaging, but also on a detailed DIN A4 supplement sheet is decent. There happened a small number screwdriver at the luminous fluxspecified however: “570-960 lm” are an involuntary understatement that significantly exceeded by reality.

My test result:

Of course, offers the “Varilux 3-in-1” (EIA €19,95) with its three control of levels of not quite rule comfort of the “4-in-1” model “LightMe” or expensive”connected lighting” systems: No dimming, not infinitely variable colour temperature setting, no mobile remote control, programmable. The Pack stating “300” for the dispersion angle ° Rotary Beeding is also slightly misleading. The sugeriert a nearly perfect round Jet characteristic, which does not have this E27 lamp.

She’s very bright – even brighter than specified, as well as noise and flicker-free, partly amazing color fidelity and with a normal wall switch to operate. The promised three color temperatures are respected as far as possible; unpleasant color casts are not noticed. TheStromsparpotenzial compared to traditional light bulbs is 80 to 85% despite up to 11.5 watts measured power consumption. According to my strict LED rating scale, these “Varilux” is a clear candidate for
three star.