Dear forum community,
We would really like to have recessed ceiling lights in our new build (precast concrete slab), but the installation of flush-mounted sockets by our general contractor was very expensive (1 spot / 185€) and somehow we missed the deadline...
After discussing with our general contractor, the suggestion was made to possibly drill core holes for the spots afterward. We now want to first talk to the structural engineer to see if that is even possible. However, we assume it will work.
My husband visited a lighting designer today, who said that a 68mm (2.7 inches) core hole for 68mm (2.7 inches) spots would probably not be sufficient, because the LED lights would get too hot in such a small hole and there would be no air circulation for cooling. According to him, the LEDs would fail almost weekly due to the heat in this setup. Therefore, holes of at least 20cm (8 inches) would need to be drilled. We are now very uncertain and don’t know what to do. Do you have any experience with this? We would be very grateful for any advice. Channels for cables would not need to be milled since the electrician would run the cables from above into the spots (upstairs).
Thank you for your help, and as mentioned, we look forward to your feedback!
We would really like to have recessed ceiling lights in our new build (precast concrete slab), but the installation of flush-mounted sockets by our general contractor was very expensive (1 spot / 185€) and somehow we missed the deadline...
After discussing with our general contractor, the suggestion was made to possibly drill core holes for the spots afterward. We now want to first talk to the structural engineer to see if that is even possible. However, we assume it will work.
My husband visited a lighting designer today, who said that a 68mm (2.7 inches) core hole for 68mm (2.7 inches) spots would probably not be sufficient, because the LED lights would get too hot in such a small hole and there would be no air circulation for cooling. According to him, the LEDs would fail almost weekly due to the heat in this setup. Therefore, holes of at least 20cm (8 inches) would need to be drilled. We are now very uncertain and don’t know what to do. Do you have any experience with this? We would be very grateful for any advice. Channels for cables would not need to be milled since the electrician would run the cables from above into the spots (upstairs).
Thank you for your help, and as mentioned, we look forward to your feedback!
I think that statement is nonsense. The LED is cooled by a heat sink inside the light fixture itself. Whether it’s installed behind a drywall ceiling or inside a concrete recess doesn’t really matter. Even high-powered spotlights are around 7 watts, most of which is converted into light, so there isn’t much heat generated.
What I find more interesting is how the sockets are supposed to be fixed inside that recess. Normally, they require some kind of layer, like drywall for example, to clamp onto.
What I find more interesting is how the sockets are supposed to be fixed inside that recess. Normally, they require some kind of layer, like drywall for example, to clamp onto.
K
Knallkörper29 Jun 2017 15:271. A larger hole than, for example, 70mm (2.8 inches) is definitely needed. Even though LED spots generate relatively little heat, it is still enough to become very, very hot if there is no possibility for convection. (Tested personally with LEDON 6 W bulbs)
2. Core drilling into the reinforced concrete ceiling is most likely not permitted.
2. Core drilling into the reinforced concrete ceiling is most likely not permitted.
R
readytorumble29 Jun 2017 19:52How many spotlights will you be installing? We have almost 30 on the ground floor alone (also in these Halox housings).
Are you planning to drill through the entire ceiling so you can wire from above? I honestly can’t imagine the structure can handle that. At least our Halox housings still have some steel in them.
I also think that LEDs still generate quite a bit of heat. There is still quite a bit of air around them inside the housings.
Are you planning to drill through the entire ceiling so you can wire from above? I honestly can’t imagine the structure can handle that. At least our Halox housings still have some steel in them.
I also think that LEDs still generate quite a bit of heat. There is still quite a bit of air around them inside the housings.
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