lights as bright as 5W halogen :-(

Since the majority of the previous reviews had the luminosity and often the light color of this LED module so praised, I got me a test sometimes can come.
Planned use The worktop lighting was in the kitchen.
So far here do three 20W halogen bulbs to their service. These are supplied from a 60 VA iron core transformer (who needs no minimum load to work)

So, now the LED module came and was also built the same. The multiple beschriebenne problem that the back-installed on the LED module capacitors are pending on Refelktor the installation lamps, I can not confirm. Although there's not much space, but the module fits completely into the light and shines straight down.

The perceived brightness but much lower than the previously installed 20W halogen bulb.
The light color corresponds approximately to a warm white energy saving lamp, the light of an energy saving lamp 'beautiful' than that of this LED module. Halogen is naturally beautiful again.
The specified color rendering index of 50 is therefore not exceeded. However, had not thought that 50 really is so horrible. (At least in the kitchen, where the eye will eat with yes)

To prove the lower brightness felt, I wanted this measure. Since I am not in possession of a professional brightness meter, I have my digital camera's exposure meter used. Measuring arrangement as follows: Camera on tripod; directed to the irradiated working area; Exposure to aperture priority set aperture fixed, ISO determines Centre-weighted average; all other lamps in from space, only the tested lamp operated alone on the 60 VA transformer.
Result of exposure:

- Goobay LED module: 1 / 15s
- 10W halogen bulb: 1 / 30s
- 20W halogen bulb: 1 / 60s

Explanation of the result: an entire exposure level (ie from 1 / 15s to 1 / 30s) is exactly twice the amount of light, or brightness. Say is the 20W halogen twice as bright as the 10W (which somehow everyone can nachvollziehn), but the 10W halogen is still twice as bright as the LED module.
My camera is of course not a precision instrument, it adjusts the exposure in 1/3 stop increments a. From 1/15 to 1/30, there are thus three stages. The statement 'twice as bright' thus has a dispersion of + -33%. But inaccuracy of measurement, also felt or not the 10W Halogen is significantly brighter than the LED module.

That reminds me, the brightness is insufficient, especially the light color for me is unacceptable for use in the kitchen, but I will continue to work here halogen bulbs. Somewhere the Stromsparerei has sometimes an end. Off when leaving the room also saves ...
For the LED bulb I'll look for a 'substandard' application. The cellar stairs would be such a place. Only the duty is so low because, as the savings effect sometime the 'investment' outweighs here again.

My personal summary of this test purchase of a LED bulb: for applications where the quality of light does not matter, rapid availability of light is required after switching and a high duty cycle is present, an LED lights may be useful today. High duty is but happy times 'continuous lighting' and because the rapid availability of full brightness not usually plays the role. And as the energy-saving lamp has clearly in the lead, since the quality of light is considerably more pleasant, and the efficiency is perhaps even better than from the LED module (the specified -88% compared to incandescent lamps, I think not, in my observation - Energy saving lamps have typical CA - 80%)
If the quality of light has 1st priority, is still nothing more than halogen.
In the kitchen, the dining table a neon tube / energy saving lamp -> OK, but beautiful halo. As a reading lamp energy saving lamp, OK, but beautiful halo.
Who wants to be and his roommates be particularly hard, can already use LED modules, I shall certainly one or two generations of LED modules wait before I again try it. The LED module has a WAF (womans acceptions factor) of close to zero and is really only what they want to surround necessarily with the latest technology for all tough guys.

Another thing to current consumption. An stabilized 12V DC 150mA, the module draws so just 1.8W and 2.4W not as stated. With rising voltage the current drawn decreases -> the current through the LEDs is thus kept constant by the electronics on the module. Good for the life of the LEDs.
The 1.8W come under real conditions then the loss of the 230V to 12V converter. The use of existing iron transformers does not make sense from an energy point of view, since, for example, a 60VA transformer has fast times 4..5W core losses. If you operate it three LED modules, the losses are almost as high as the power drawn. Electronic (halogen) transformers are to be used in very rare cases further, as these usually require a fairly high minimum load that does not represent the LED modules. Thus, the use of a performance standard matching LED transformer is actually compulsory if you want to have LEDs necessarily (and save electricity wants)

Hope my judgment helps one or the other at the illuminant selection ...