Dear all,
Winter is coming and I'm building my own daylight-therapy light/lamp,.
With only basic electrical theoretical knowledge, I have some practical concerns I need help validating. I will not run this light for more that 45 minutes at a time.
Construction (see attached picture):
I will run four 'slings' of 11 36V LED COBS in series, making a total of almost 400V on 175 mA constant current per 'sling'.
Totaling a constant current of 4x175mA = 700 mA, which is powered with a MeanWell HLG-320H-C700A.
The LED COBS are Cree CMU1006-0000-000N0H0A65G (44 of them in total).
The LED COBS will be glued with heat conducting glue (1 W/mK) to a 600mm X 800mm 2mm thick aluminum plate/sheet, which serves as the lamps structural back pane.
The interconnections will be with 18 AWG (0.75 mm2) wire, soldered to the LED COBS.
What I would like to get validated by you guys:
1. High voltage concerns
A. Is is ridiculously dangerous to have 400V inside? (even with low current of max 700 mA). There will be acrylic front cover and wooden sides, so no accidental access to the interior will be possible.
B. The LED COBS soldering points are just a mm above the large shared aluminum sheet. Is there any risk of short circuit arc/sparking?
Here I do not understand if I have a 400V 'arc/spark'-risk situation or if the voltage potential is more like 36V (as the individual LED COB).
C. I will add on/off button and a Fuse Holder+1 A fuse. Do these components need to specified for 400V, or is my low current allowing me to use almost any 12V/car components?
2. Heat management concerns
A. Will the large aluminum plate be a sufficient heat sink for a total of 300W LEDs?
3. General electric circuit and LED operation
A. I hope my power assumptions (constant current and the 400 V range), parallels and series solution is correct.
Would love to hear you experts comments on this.
Thank you very much from a pitch dark Sweden.
Winter is coming and I'm building my own daylight-therapy light/lamp,.
With only basic electrical theoretical knowledge, I have some practical concerns I need help validating. I will not run this light for more that 45 minutes at a time.
Construction (see attached picture):
I will run four 'slings' of 11 36V LED COBS in series, making a total of almost 400V on 175 mA constant current per 'sling'.
Totaling a constant current of 4x175mA = 700 mA, which is powered with a MeanWell HLG-320H-C700A.
The LED COBS are Cree CMU1006-0000-000N0H0A65G (44 of them in total).
The LED COBS will be glued with heat conducting glue (1 W/mK) to a 600mm X 800mm 2mm thick aluminum plate/sheet, which serves as the lamps structural back pane.
The interconnections will be with 18 AWG (0.75 mm2) wire, soldered to the LED COBS.
What I would like to get validated by you guys:
1. High voltage concerns
A. Is is ridiculously dangerous to have 400V inside? (even with low current of max 700 mA). There will be acrylic front cover and wooden sides, so no accidental access to the interior will be possible.
B. The LED COBS soldering points are just a mm above the large shared aluminum sheet. Is there any risk of short circuit arc/sparking?
Here I do not understand if I have a 400V 'arc/spark'-risk situation or if the voltage potential is more like 36V (as the individual LED COB).
C. I will add on/off button and a Fuse Holder+1 A fuse. Do these components need to specified for 400V, or is my low current allowing me to use almost any 12V/car components?
2. Heat management concerns
A. Will the large aluminum plate be a sufficient heat sink for a total of 300W LEDs?
3. General electric circuit and LED operation
A. I hope my power assumptions (constant current and the 400 V range), parallels and series solution is correct.
Would love to hear you experts comments on this.
Thank you very much from a pitch dark Sweden.
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