Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This Question of the Day, on lamps and light sources - dichroic lamp terminology, is answered by OSRAM:
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| A typical dichroic lamp. |
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Question: Please would you explain the term dichroic? Also, can it refer to both both low voltage (LV) and mains lamps? Finally, what is the difference between gu and gz?
Answer: The word 'dichroic' means that it splits electromagnetic radiation into two distinct areas. Here we are talking about visible light and heat radiation. A dichroic filter will allow visible light to go forward, but will allow the infrared radiation to go out through the back of the reflector. Nearly 2/3 of the total heat produced is allowed to go through the back of reflectors. These lamps can also be referred to as 'cool beam'.
Dichroic lamps can also be in LV and mains voltage variants, with reflector.
Finally, the GU base referes to aluminised reflector which will throw light and heat forward. The GZ refers to dichroic filters.
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