The search can be dimmable LED replacement for halogen rods to the endless Odyssey – no happily ever after. Two new, expensive experiments with R7s lamps of “bluebulls” and Lumixon in a new, more compact design was reasonably successful only at first glance. The laboratory tests revealed: the each promised luminous flux values were not reached by far – and that was only a part of the debacle.

For almost five years I tried again – with mixed success: finding an acceptable LED replacement for our dimmable floodlights with 118 mm long 150-Watt R7s halogen rods. Initially, these retrofits were still very chunky things for which I had to clean partly reflectors and other obstacles from the light housing. One often never needed these parts because these obesity suspicious and very expensive special lamps had only a limited viewing angle.

And if I had all this conversion stuff behind me then, there was still no reason for jubilation storms because light colour, colour rendition, brightness and dimming could not compete with the old power guzzlers. So far, so bad.

Even Philips now has a R7s-LED lamp

Meanwhile, the technique was further developed and even Philips ventured out end of 2015 – first of the big manufacturers – with a new R7s LED design for less than 15 euroson the market: Round, oblong, very efficient, wide half value angle (approx. 300 degrees), with less than 23 mm diameter pleasantly compact, aluminum, partly plastic (PR photo on the right). The “CorePro R7S 118 mm” is however unfortunately not dimmable, delivers only manageable luminous flux (806 lumens from 6.5 Watt) and a “cooler” color temperature than desired (3000 Kelvin, but still considered “Warm white”).

My target was this time: at least 1000 lumens, about 2700 K, dimmable, design which fits without modification in the washer-head, round round radiation. At least on paper, several candidates offered. I bought then ever a model of “bluebulls” in Austria and Lumixon in Bremen, which played for surprises – especially for negative.

The feeble, now eingeschläferte boy

13 Watt and impressive 1400 lumen it should have, the less than 30 Euro R7s LED flashlight by with six rows à 12 SMD Chips on an aluminium frame, clear Acrylic plastic. To do this, the 67 grams should light, 118 mm long and 25 mm thick retrofit be dimmable and have a 360-degree beam angle.

Came it without disturbing print (heard) however in the EU to the compulsory programand in a bare, white cardboard (photo right), the betrayed only by a small sticker on the bottom (bottom left), what might expect the buyer. EU eco-label? Nominal service life? Color rendering index? RoHSor CE mark? All absent! Thus, this lamp would be actually not marketable and the provider a case for regulators.

I was even more surprised when trying it out. Because the brightness seemed away – far from the nominal value so downward, not upward.

Instead of 13, the lamp moved only about 7 watts

And indeed: at the desk in an open test version launched the lamp but without great thinking time (less than 0.5 seconds), remained completely silent and was warm after two hours maximum 65 degrees. The “energy master” showed at this time but only 7.3 instead of 13 Watts at a Effect factor of 0.71.

The laboratory of my cooperation partner “David communication” confirmed my impression in a drastic way. Here, measured and just 637 lumen were determined after two hours 6.9 Watts – less than half of the nominal value (Pdf download of the test protocol)! On request, the provider wrote to me:

“Unfortunately has the production due to problems reduced performance due to overheating and not communicated that to us. Therefore, we have set sales of this bulb until we have found a solution for this already. We will refund you back book, need the bulb, do not return to us. Thank you for your understanding!”

No, I have no sympathy. Who sells Dubious LED bulbs without EU marketability unchecked, should first firmly have to pay penalty and then are looking for a new occupation. Strange that there are still positive reviews for these and similar failures, the can bring an entire industry into disrepute.

Light color and color fidelity are

For completeness: color temperature (2644 K) and fidelity (RA 83.3) corresponded to at least comply with; the spectral diagram with the distribution of power in milliwatts per nanometre wavelength shows may begin somewhat yellow green tint struck me why the light:

I do without the usual image of the light and the color fidelity standard motif with the mopeds here, because they look exactly like the Lumixon R7s lamp would do the photos in the test below. The half value angle of “bluebulls”: 315 degrees vertical(Download pdf of the diagram) and 110 ° horizontal (Diagram) – this is similar to the halogen flashlights.

Amazingly smooth dimming

Surprisingly well, the now eingeschläferte “Blue Boy” on various dimmers, where itself although the delay slightly extended, but even on non-adjustable models proposed regulation between 2.8 and 7.6 Watt (total power dimmer + lamp) was possible.Adjustable models was extended 0.8 7.4 w up to, which roughly corresponds to a flicker-free span between 5 and 100% brightness. Also on phase control dimmers, as they are often integrated into halogen floodlights, the “bluebulls” remain silent – for the dimmer can distance Zoom up to approx. 20 cm.

They of – with a large inaccuracy “Flicker Tester” app measured Flicker values remained risky – consistently in a middle range (index 0.1, rate of between 35 and 42% at 100 Hertz reference frequency), which by most people and by the display of my DigiCam as stable light is perceived, but already properly on the biscuit can be particularly Flimmersensiblen. In the online description promised, extremely high rated life of 50,000 hours of light or a million switching cycles seems similar to believable as the Lumenangabe and suggests a determination by the throw of the dice.

My test result:

R7s-LED flashlight with real 7 Watt and 637 lumen needs to be actually not dimmable – lights already innately decent enough and can in the brightness even with a 50 W halogen bar keep. That mass, weight, Dimmability, light colour and colour fidelity correspond to the dealer’s “bluebulls” – free.

For such LED bulbs from China with fancy values and without EU marketability to demand even Mondpreise, can be explained only with impudence or fraud, should – be traced actually legally or at least by the market regulator critically checked should.

My LED rating scale ranges from one to five stars. In this case I must not try however at all they, because there can be only a judgment:
No Star!

The Lumixon lamp with loss of lumen

After the debacle with the “bluebulls” lamp it could be only better with the Lumixon R7s for around 25 euros. Finally, time was one of my advertising partners the Bremen provider and has Some really good LED products in the program. And indeed: despite lower power ratings (10 Watts, 1100 lumens) this lamp in the laboratory was brighter than the nominally 13 W strong competitor – she exceeded those to almost 3 lumen (in words: three)!

Already the cardboard packaging impressed with numerous data (right photo) – noteworthy example, the since autumn 2013in the EU not more valid ecolabel gradation from G to A. And please don’t tell now that this Lumixon is any older stock, so legal are likely sold off. To my knowledge was not there this R7s-LED construction namely on the market.

The Pack stating “Cycle of operation 15000” bites unfortunately with the online promised nominal service life of 30,000 hours of lights and 100,000 switching cycles. Also puzzling: I bought had the Lumixon model R7s-3749 demonstrably and according to the description, get I have one according to pack with the number 3695. There used to be the proverbial pig in a poke, nowadays it is evidently the Chinese LED lamp in a box – with similar surprise.

Here 72 SMD LEDs

At first glance seemed to be the Lumixon a clone of the “bluebulls” lamp: roughly the same short delay of under half a second, almost identical maximum temperature of 64 degrees after two hours “Swing a”, same brightness and light yellow-greenish colour, like “Flicker Tester”values on the switch (index 0.1; A rate 33% at 100 Hz reference frequency), also six around distributed rows à 12 SMD LEDs on an aluminium frame, wrapped in clear acrylic.

At second glance, however, there are differences: Only 22 mm diameter, provided with 51 grams lighter and with various printing – about the CE and RoHS logos on one, as well as some performance data on the other side (photo left). Also my ELV-“Energy master” at the normal desk reported staggering 7.9 Watts power consumption at a power factor of 0.71 – the Pro Lab was able to measure even 8.2 W and factor 0,75.

1100 lumens remain a pipe dream

Since there are now two possibilities: either which is nominally 10 W strong Lumixon far more efficiently than promised or again as a “China firecracker” with fantasy values. The Sphere revealed (Pdf-download of the test protocol) – more than 40% below the nominal value approximately 639 collected Lumens the sad truth!

Again, dimming is so much useful like the reins of a lame horse, especially since my corresponding experiments partly with noticeable flicker and were punished very high values of flicker. That was ‘ up to index 0.2 and rate of 60%, with the display of my camera showed even “rolling shutter”strips.

Has been saved here in electronics?

Possibly Yes the light weight and size advantage over the “bluebulls” lamp stems from, inter alia, that voltage-stabilizing components were omitted. Who is sensitive to such unstable light: finger away or operate only without dimmer!

Still, you want to know how the part is lit? All right: with 2628 Kelvin color temperature and color rendering index RA 82.7 at an average value of 14.2 for additional measuring color R9 (“red saturated”). My default color fidelity motif with two bikes in miniature against a white background looked in the light of the Lumixon out (white balance “daylight”, without post processing):

The shadows are fray something, goes the subjective impression despite the fairly good Colour position towards yellow green – otherwise, the colors are represented but quite decently; also the deep blue not flooded, but appears only slightly yellowish as in natura. As far as matches largely many RA-80 LED lamps on the market and is still considered acceptable.

Very good dispersion

The beam pattern I must at present in two images – even in horizontal position:

… and even at top view in the vertical position:

Here the Laboratory determined an optimum half value angle of less than 322 degrees (Download pdf chart). The light cone is however upward and down through the lamp design limited. Therefore, there are lateral only to around 110 degrees. More you don’t need but also, if an existing light reflector is used and can provide a much wider coverage. The shadow right in the picture come by the way of the goggle crossmember and are not a problem of the lamp.

My test result:

This shot also missed vigorously; I got a 118 mm long Lumixonfor Just € 25 – R7s-LED lamp “made in P. R. C.”, which in part at all was not the Online description : another model number and packaging with stale EU eco-label, different switching cycles- information, according to our measurements only approx. 8 instead of 10 Watts strong schlappe 639 instead of 1100 lumen luminous flux. So that you can replace a 50 W halogen rod with much benevolence, perhaps, not more.

A severe flicker in dimmer operation came at the test – phase angle control, the lamp can flicker visible also depending on the dimmer setting. Unfortunately fall still many “average consumer” on something like this and hype that even with positive reviews.

It is doubly a shame because this new R7s-LED construction form in itself is a good approach: very compact and lightweight, therefore much suitable for retrofit as the old blocks, really some bright and with 72 acceptable, “warm white” LED-chips fitted. In principle you do that even with the trendy CoB light threads – such “Filament”-LED flashlights are also still too weak, too expensive and may get too hot for larger luminous flux.

A reputable manufacturer/provider that gets to an SMD – or CoB-LED equipped part of the chain – with real 1000 lumens or more, maybe found at least 100 lm/W efficiency, RA > 85, flicker-free, largely easily dimmable and under 25 euros? Sign in then immediately below in the comments! Anyway, this Lumixon failed here, is in this form also non EU marketable and should actually immediately disappear from the trade. Therefore here the same judgment as for the “bluebulls” lamp: my proper LED rating scale of one to five awards…
No Star!