Browse Forums Lighting + Lighting Design Re: downlights setting fire to insulation in the roof 42Jul 31, 2007 7:28 pm Thats right, where you might have had a 75 or 100w globe lighting up a room in the past, now you might have 4 downlights.
4 x 50w globes is equal to 200w + a few more watts because of transformer consumption, and you have tripled your power consumption for the room. And as stated earlier, just because they're called low voltage people automatically assume a power saving.....INCORRECT..... unfortunately. Re: downlights setting fire to insulation in the roof 43Aug 01, 2007 6:43 pm Aurora - wrote
Quote: Is this true? How much extra would you be looking at per bill? The extra running costs of halogens could be like this - just for 1 room. Multiply this throughout the house and well ??? You can work out the power bill Lets take a typical room. HALOGEN COSTS = $30.26 per quarter If we had 6 x 50 watt halogens - Typically they use 60 watts with an extra 10 watts being the losses in the transformer. So that is 60watts of power x 6 lights = 360watts - The average commonly used room is lit around 35 hours per week. There are 12 weeks in a quarter. (Normal power bill duration) So this halogen lit room will use 240watts x 35hours per week x 12weeks 360 x 35 x 12 = 151200 watts per quarter Power bills show this in kilowatts so we divide it by 1000 to get kilowatts which = 151.2 kw (Kilo watts for that quarter) and we pay around 20 cents per kilowatt. So that equals $0.20 x 151.2 = $30.24 to light this one room with 6 x halogens. COMPACT FLURO RUNNING COSTS = $1.26 per quarter Do the same room with 1 x 15 watt CFL and you would be paying 15x35x12 = 6300 watts = 6.3kw x $0.20 = $1.26 per quarter for the same room. (OK so lets say we need 2 x 15watt CFL's - thats makes it $2.50 for the room for the quarter - A big difference.) And if you went LED technology then it could be less again or at least simlilar to the CFL lighting costs. So basically about 12 to 24 times more expensive to run halogen lights over CFL lights. Yes - it is a different type of lighting - but with the right bulb type and diffusers angles etc, it can still look as good. and guess what - nowhere near the fire risk Re: downlights setting fire to insulation in the roof 44Aug 01, 2007 6:57 pm Friends of mine in their wisdom….NOT….stored ALL their stuff in the ceiling cavity. Which was quite high, as their home is a Colonial style with a high pitched roof.
AND yes some paper which was too close to a down light caught on fire, half their house burned down!!!! DON’T store stuff in the roof cavity, you are asking for trouble! I heard of another fire happening with electrical’s that were done wrong, and up it went as well….down lights. I have down lights throughout my home…..no insulation, and yet I still worry. I never go out and leave my lights on; I always leave a lamp on. Internal and External Building and Colour Consultant Online - Worldwide http://www.denovoconcepts.com Re: downlights setting fire to insulation in the roof 45Aug 01, 2007 7:00 pm thanks for that breakdown of cost. that was really interesting.
I know previous posts have said that you cannot run CFLs off 12v and that you must have 240v connection. is this still the case and will this change in the future. what are the options for energy (and cost) efficient downlights in a 12v fitting? Re: downlights setting fire to insulation in the roof 46Aug 01, 2007 8:03 pm I am pretty sure there are 12 volt compact fluros out now as well as 12 volt LED lighting for boats and caravans etc.
So I assume you're thinking solar batteries and no inverter? Re: downlights setting fire to insulation in the roof 47Aug 01, 2007 8:06 pm mmmm, perhaps that is what I am thinking. but i don't know what those terms mean
could you explain please Re: downlights setting fire to insulation in the roof 48Nov 21, 2007 11:31 pm We had a case over here in Wa lastnight where an air con was fitted yesterday, and the house burnt down lastnight.
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