QUOTE(blanket84 @ Jul 27 2020, 01:39 PM)
Thank you for you answer. I saw in the leaflet for marcasite the height is 2.9cm. But on top of the 2.9 cm, how much extra allowances do we need to allocate? What about distance from beam from the side, if any?
And in the leaflet also there is "recessed distance" specification which is 5cm. What is that actually?
My floor to ceiling height I measured is 10ft and 4 inches, the beam is 14 inches and almost 1ft wide (I forgot to measure, it definitely looks wider than the normal 6 inches beam. If I level the plaster ceiling with the beam, net remaining height would be around 9ft 2 inches. How much lower should I go to install downlight directly under the beam? I will be installing ceiling fan as well, so I can't go too low.
And another restriction is that I want my ceiling to be flat. So, having different level of ceiling fan and downlight is not really preferable.
Personally I think you should just do your plaster ceiling level with your beam and thus make your ceiling height at 9’2”.
In this case you may have to relocate your lights that you planned to be directly under the beam but I don’t think it is a big problem. If you don’t want you can also drill “holes” under your beam to put in your lights but this is not advisable as I think you can come up with better creative lighting placement solution. You may need to drill through the beam to get some wiring through too but I think it is better to get the highest ceiling you can.
With the gap between your plaster ceiling and original ceiling, it should be enough to accommodate most downlights as well as wood/steel beams for fan hooks (if needed).
I am attaching a real profile of Philips 4” marcacite. It is really slim at 29mm thickness
This post has been edited by blancpain4470: Jul 27 2020, 06:55 PM