http://www.olino.org/us/articles/2009/04/09/35w-gu10-halogen-light-spot Renewable Energy Sun, 05 Feb 2012 07:58:49 +0000 http://wordpress.org/?v=2.9.2 hourly 1 http://www.olino.org/us/articles/2009/04/09/35w-gu10-halogen-light-spot/comment-page-1#comment-137547 Marcel van der Steen Mon, 12 Sep 2011 23:32:49 +0000 http://www.olino.org/us/?p=1405#comment-137547 @ Robert. This lamp is not a high quality lamp. One can see that at the low lumen efficacy. Also the low temperature will lead to the low efficacy. This lamp will most liley have a long lifetime as it burns at relatively low temperature. I have also measured quality halogen lamps like Philips'. Then I could differentiate between cold beam halogen lamps with a CCT of 3000 K which were at about 20 lm/W. These will have a life comparable to a normal light bulb of 2700 K I expect. Furthermore these have a rather high efficacy but the 3000 K will not always be attractive. Also one can find quality warm beam halogen lamps and then you are back at around 2700 K. The efficacy drops again but lifetime increases. With the lamp measured in this article however, I expect it to be af not too high quality (it was a no-name) and I assure that the voltage used was 230 V AC as it is kep constant with help of a variac and every second the value is measured and adjusted. @ Robert.
This lamp is not a high quality lamp. One can see that at the low lumen efficacy. Also the low temperature will lead to the low efficacy. This lamp will most liley have a long lifetime as it burns at relatively low temperature.
I have also measured quality halogen lamps like Philips’. Then I could differentiate between cold beam halogen lamps with a CCT of 3000 K which were at about 20 lm/W. These will have a life comparable to a normal light bulb of 2700 K I expect. Furthermore these have a rather high efficacy but the 3000 K will not always be attractive. Also one can find quality warm beam halogen lamps and then you are back at around 2700 K. The efficacy drops again but lifetime increases.
With the lamp measured in this article however, I expect it to be af not too high quality (it was a no-name) and I assure that the voltage used was 230 V AC as it is kep constant with help of a variac and every second the value is measured and adjusted.

]]> http://www.olino.org/us/articles/2009/04/09/35w-gu10-halogen-light-spot/comment-page-1#comment-137492 Robert Mueller Mon, 12 Sep 2011 23:13:11 +0000 http://www.olino.org/us/?p=1405#comment-137492 I am very surprised by some of these data. The color temperature is below what is usually reported for a simple (non-halogen) bulb and I thought halogen lamps operate at higher temperature, suggesting higher color temperature. Of course, the reflector could shift the color temperature downward, but I would expect the opposite for coatings designed to leak long wavelengths. Was this a quality lamp and was it running at its proper voltage? The behavior suggests either poor quality or a problem with voltage. I am very surprised by some of these data. The color temperature is below what is usually reported for a simple (non-halogen) bulb and I thought halogen lamps operate at higher temperature, suggesting higher color temperature. Of course, the reflector could shift the color temperature downward, but I would expect the opposite for coatings designed to leak long wavelengths. Was this a quality lamp and was it running at its proper voltage? The behavior suggests either poor quality or a problem with voltage.

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