A house with a flat metal roof in Canberra (>40 degr C in summer),
and living areas immediately under it... There's a 20cm clearance
between the ceiling and the roof. Is it OK to install ceiling LED
down-lights in that context? If not so, would pendant LED lights
do the job? The lighting requirements are that of a retired
couple... Current lighting luminaries are of the incandescent
spotlight type. Much obliged.
LED down-lights under FLAT ROOF(19 posts) (14 voices)
A house with a flat metal roof in Canberra (>40 degr C in summer),Posted Tuesday 2 Aug 2011 @ 10:29:01 am from IP #
You can do it with that clearance - there are LED downlights that would work in that space.
Given the 40C temperatures, does it make sense to cut a hole in your insulation to install a recessed downlight?
Can you put LED bulbs in your existing fittings? I wouldn't replace halogen downlights with LED bulbs, but I would put an LED bulb in a pendant fitting. Halogen downlights are too small physically for a 10W LED bulb (although some would argue otherwise), and it works better if you replace the whole halogen fitting with an integrated LED fitting with a decent heatsink above.
Are there other options that would also work, such as LED panel lights, or an LED conversion of a fluorescent tube fitting (see Lance's article in a recent ReNew magazine), or LED strip above pelmets illuminating the ceiling?Posted Tuesday 2 Aug 2011 @ 10:54:17 am from IP #
I just replaced 15 50W Halogen downlights and other lights with 26 14W 240v LED (Warm Light) downlights and I must say I'm impressed.
Not only are the 240v LED downlights much cooler and safer than the 50w Halogen, but the lighting is much nicer, it's not a yellow light, more like middle of cool white and warm.
I was quoted $120 to $150 for 8w LED downlights from local lighting specialists, I finished up sourcing the 14w for around $60 each and these swivel as well.
In the family room, we generally have 1 bank of 3 downlights on most of the day, we've reduced our lighting from 150w to 42w with no little loss of lighting brightness.
10 LED's were installed in the family room with a flatish roof and even after being on for 1 hour, are only luke warm to touch, those horrible 50w halogen would give you a nasty burn, dangerous as well as one 50w was installed 1/4" from a timber beam that was scorched quite badly.
Kind Regards, KenPosted Wednesday 3 Aug 2011 @ 6:22:49 pm from IP #
Where did you source the 14W LED downlights ?
TonyPosted Wednesday 3 Aug 2011 @ 8:15:05 pm from IP #
Brightgreen advertised in the latest "the Master Electrician" magazine. They're 16W but claim to be the worlds first LED downlight that matches the brightness, light quality and beam width of a 50W halogen.
Lance may like to comment on that claim as I know he's been fairly engrossed with the LEDs on the market.
(click on the photo to rotate the view)Posted Thursday 4 Aug 2011 @ 8:07:40 am from IP #
The d900 looks impressive !
Where can I buy them and at what price ?Posted Thursday 4 Aug 2011 @ 10:09:25 pm from IP #
Google is your friend : )
There's plenty of places such as http://www.electricalproducts.com.au/brightgreen-d900-led-downlight.html and http://lightingmatters.com.au/led-downlights-complete-kits/91-brightgreen-d900-cube-16w-led-downlight-warm-white.htmlPosted Thursday 4 Aug 2011 @ 10:58:24 pm from IP #
Will the savings ever justify the investment of $130 each ?Posted Friday 5 Aug 2011 @ 3:46:04 am from IP #
Apart from safety and comfort issues, if they are used heavily they will show a return on investment over their life, e.g. assume 12 year life, 7% and 6 hours per day use;
av. hours per day 6 6
kwhr/yr 35.04 109.5
cost /kwhr 0.22 0.22
cost /yr 7.71 24.09
present value, 12yrs, 7% 130.1107
So the present value of $130 can be exchanged for the future savings if you accept 7% return (assumes no price rises for power)
Also they save quite a load of CO2 emissions in this case.
I bought a few cheaper led's before doing this calculation, I have only one in a stairwell that would go close to satisfying an investment return, but the gud's I replaced in our bedside reading lamps are fantastic compared to the hot old halogens!Posted Friday 5 Aug 2011 @ 5:03:40 am from IP #
Yes, and you can't assume the cost of electricity will stay as it is, it will go up considerably in the next decade or so I expect...Posted Friday 5 Aug 2011 @ 5:31:02 am from IP #
Another related question - we will also have a similar flat roof in our new build (probably more space than 20cm, I'd assume 30-40cm - whatever a standard skillion style roof truss is).
Anyway, my question is do you have to shield the LED bulbs from insulation batts? Or is there some sort of a cover that is required?Posted Friday 5 Aug 2011 @ 7:35:29 am from IP #
Try Halers Evoled downlights, they are fire rated to be overlaid with insulation. We have them in our flatroof extension (sunroom/patio converted to a dining area) with no problems (5 months and counting)Posted Sunday 7 Aug 2011 @ 11:49:14 pm from IP #
Also you have to consider the drain on batterys if your on an off grid system wear and tear, the least power you use the longer the batteries will last, well that's what I think
I am looking at getting some LED lights for my off grid home, it's about 300 square meters. no idea what brightness or how many I will need or how many, I guess I would need one set for kitchen area, lounge room area, toilet and loft, and maybe one for the porch, and patio.
I guess its a buy and see approach, what kid of brightness do you think I would need, not sure if to go for 12 volts or 24 volt lights, i have read 24 volts are better and more efficient, would be going with a 24 volt system, but 12 volt appliances when needed or necessary if no 24 volts are available.
Thanks for any advice.Posted Saturday 24 Aug 2013 @ 9:56:26 pm from IP #
just use pendants. You get twice as much light with the same wattage. Plus replacements are cheaper. Plus you don't have holes in your ceiling
Aldi has 4 packs of GU10 downlight globes for $35. I got one GU10 LED lamp, it creates a spot. The CFLs do not.Posted Saturday 24 Aug 2013 @ 10:35:52 pm from IP #
We are building with a flat roof and plan to use surface mounted down lights so we have less holes in the insulation (South east Victoria is cold!).
Is this the right way to go?
Are LED globes in a standard light fitting as efficient and durable as one unit comprising both LED light and driver?Posted Tuesday 18 Apr 2017 @ 10:42:42 am from IP #
Adding tags!Posted Tuesday 18 Apr 2017 @ 10:43:45 am from IP #
LED globes in a standard fitting do comprise the LED light source and driver, it's just the format that's different.
For modern style homes, surface mount downlights work fine, but for older style homes, batten lamp holders and/or pendant lights usually look better, although they are more of a dust collector. But you can use the nice filament LED bulbs in them, so you get the look of incandecent bulbs with a tenth of the energy use.
Either way, the fewer holes in the ceiling and insulation, the better.Posted Tuesday 18 Apr 2017 @ 11:16:33 am from IP #
I have got those LED strip lighting in my log Cabin and just screwed them to the overhead beems and concealed them with a couple of rebated timber strips either side with a 10 mil gap.
Can't see the lights but bulk bright light flood every nook and cranny.
Got them at Jaycar cheep for what they do and 12 volt.
I just connect them to a 12v stand alone system and they use bugger all power and I'm running 10 meters of them.Posted Friday 21 Apr 2017 @ 8:49:17 am from IP #
Or you could use LED strips. They come with an adhesive back and can be stuck directly to the ceiling. A little over a dollar per meter! Plenty of light but not your "standard" look.Posted Sunday 23 Apr 2017 @ 1:57:42 pm from IP #
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