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Choosing the Right Power Supply for LED Lamps in a KNX Installation

rafdyd 3432 11
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 16267258
    rafdyd
    Level 12  
    Hello.
    At the customer's site, I want to replace light sources from halogen to LEDs. In the photo below I have uploaded the data of the power supply used for halogen lamps. Which power supply do you recommend with these parameters for leds? The customer has a KNX installation and system. I also put in the data of the light source that the client wants to use.
    Thank you in advance for your help.
    Attachments:
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  • #2 16267280
    Zbigniew 400
    Level 38  
    How many lamps? Common power supply?
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  • #3 16267349
    rafdyd
    Level 12  
    Zbigniew 400 wrote:
    How many lamps? Common power supply?


    Hello.
    The lamp is 32pcs. but in different quantitative configurations.
    Generally, for halogens, 26 pieces are used. power supplies. There will be the same number for LED lamps, but they do not have to be up to 210W.
    The largest amount in one combination is 6 pcs. double lamps (12 bulbs).
  • #4 16267499
    p407s
    Level 9  
    Why don't you use this power supply? One power supply (the one in the picture) is enough to power 4 to 16 LED lamps, and you do not have to buy new ones. Only if you want to power 3 or fewer lamps you have to give smaller.
  • #5 16267634
    kazikszach
    Level 38  
    p407s wrote:
    Why don't you use this power supply? One power supply (the one in the picture) is enough to power 4 to 16 LED lamps, and you do not have to buy new ones. Only if you want to power 3 or fewer lamps you have to give smaller.

    Do you know what this power supply is and how it works?
    Electronic transformer name.
    LEDS, even those on 12V AC, will evaporate after a minute or faster.
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  • #6 16267655
    korrus666
    Level 40  
    kazikszach wrote:

    Electronic transformer name.
    LEDS, even those on 12V AC, will evaporate after a minute or faster.


    Where does this belief come from? I don't see any grounds for that.
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  • #7 16267684
    rafdyd
    Level 12  
    p407s wrote:
    Why don't you use this power supply? One power supply (the one in the picture) is enough to power 4 to 16 LED lamps, and you do not have to buy new ones. Only if you want to power 3 or fewer lamps you have to give smaller.


    I'm so sorry, but you're wrong. The power supply adapted to halogens behaves like a small "strobe" when connected to LED lamps. They are visible to the naked eye when the lamp is flashing. Of course, this sentence about the strobe is exaggerated, but such a power supply cannot be used for LEDs.
  • #8 16267685
    kazikszach
    Level 38  
    korrus666 wrote:
    kazikszach wrote:

    Electronic transformer name.
    LEDS, even those on 12V AC, will evaporate after a minute or faster.


    Where does this belief come from? I don't see any grounds for that.

    Have you tried to connect such LEDs to such a transformer, or are you just theorizing?
    The principle of operation of such a transformer is pulsed operation with a frequency of several dozen kilohertz, for a bulb it does not matter, but LEDs for 12V AC have rectifiers adapted to 50 / 60Hz power supply and they cannot withstand several dozen kilohertz.
    The LED in the photo is also on the frequency of 50 / 60Hz.
  • #9 16267713
    korrus666
    Level 40  
    It all depends on what the rectifier is and what the rest of the power supply for this LED lamp looks like.
  • #10 16267835
    kazikszach
    Level 38  
    korrus666 wrote:
    It all depends on what the rectifier is and what the rest of the power supply for this LED lamp looks like.

    Have you encountered one with a fast rectifier?
    For the author: use ordinary 12V DC transformers or power supplies with a power of 25-30% higher than the power of the LEDs that will power them.
  • #11 16268008
    rafdyd
    Level 12  
    Gentlemen, we're departing from the topic :) . I will not use these old power supplies because I know that they are not 100% suitable. Now, if someone has a moment, please help me in choosing :) .
    Greetings.
  • #12 16268075
    kazikszach
    Level 38  
    kazikszach wrote:
    12V DC power supplies with a power of 25 ÷ 30% greater than that of the LEDs that will power them

    Here you have specific guidelines, you have to judge the power yourself depending on the configuration of the lamps.
    Having the power to look for offers and choose.
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Topic summary

The discussion revolves around selecting an appropriate power supply for replacing halogen lamps with LED lamps in a KNX installation. The user seeks recommendations based on the specifications of the existing halogen power supply and the desired LED lamps. Responses highlight the importance of using a compatible power supply, noting that traditional halogen transformers may not work effectively with LEDs due to differences in operational frequency and rectification. Suggestions include using 12V DC transformers or power supplies rated 25-30% higher than the total wattage of the LED configuration. The conversation emphasizes the need for careful consideration of the power supply's characteristics to avoid issues such as flickering or premature failure of the LED lamps.
Summary generated by the language model.
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