i got similar problem with u....i oso dowan my ceiling low but my plster ceiling contractor told me not recommend to do L-box if no flat plaster ceiling cos the light effect will make us easy to see the uneven wall. he recommend me to install 4inch flat plaster ceiling....

wah!! my contractor not yet start work so i not dare to recommend u 1 but his price not the cheapest cos he charge 2.50 but his service is good.....i ask him to come see my unit for more than 4 times without paying deposit and until now he oso not yet start work cos have to wait my kitchen renovation....
he only do plaster ceiling so he got wiring fren and i ask for that and luckily the wiring man do sell aircond oso so he quote me daikin inverter price with conceal piping and i think reasonable.....here my plaster ceiling quotation.....is a condo size 1100+sft

Item Descripton Qty Unit price Amount(rm)
1 PLASTER CEILING 855.20 2.50 2138.00
2 FAN HOLE & LIGHT HOLE(LABOUR CHARGES) 1.00 200.00 200.00
3 MANHOLE (ALUMINIUM) 3.00 55.00 165.00
4 LIGHT BOX 1 300.00 300.00
5 L BOX FOR THE AIRCON 1 150.00 150.00


2953.00
not sure cheap or not la but i think reasonable kua.......
for wiring man quotation on aircond....

TO SUPPLY AND INSTALL 1.0HP AIR COND [WALL 1450
MOUNTED]WITH COPPER PIPING,WATER PIPING,
HACKING,PLASTERING AND TERMINATION CABLE.
-1.0HP AIR COND INVERTER[WALL MOUNTED]

TO SUPPLY AND INSTALL 1.5HP AIR COND [WALL 1750
MOUNTED]WITH COPPER PIPING,WATER PIPING,
HACKING,PLASTERING AND TERMINATION CABLE.
-1.5HP AIR COND INVERTER[WALL MOUNTED]


i think reasonable kua if including the conceal cos i check jintex electronic price for aircond cheaper but without installation....if installation add 150 if not mistaken....add up a bit cheaper than my wiring ppl but i dont think shop will do conceal lor......i think la....hahaha

agreed

start business 2 years and got 10 years experience.....u should get some pic on ur work for ppl reference......just my 2 cent...

This post has been edited by Pennbattle: Dec 28 2012, 09:46 AM

guess is sealer....luckily i read ur problem earlier....
i went to purchase paint for my condo and the seller told me about this...without sealer for darker color i choose will got white spot with dust....i told him i skim my wall liao and he said still the same cos skim coat=powder.....sealer different....so i think u need sealer....i purchase sealer too....worry will happen like urs....

u need to think what downlight u wanna use first.....the long 1 i think around 6-7inch so ur ceiling will be around 7-8inch....if u use the side i think around 6inch...if u use flat type LED downlight then u can go 4-5inch kua....call the plaster ceiling contractor la....i pm u my plaster ceiling contractor and u ask him....he like to chit chat...hahahha

the fan cover cannot adjust?

LED downlight nowaday i think selling from 40->100.....so is ur choice....go to top ten and house of lighting to check it out.....
i bought mine 4" for 50 and 6" for 90....very bright so far so good....