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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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    • CommentAuthorDavipon
    • CommentTimeDec 5th 2008
     
    Wondered if any of this technology was already available(ie marine lighting)waiting to be utilised by solar friendly people?
    • CommentAuthormark_s
    • CommentTimeDec 6th 2008
     
    And is that shot an accurate representation of the room?

    # Exposure Time (1 / Shutter Speed) = 1/15 second = 0.06667 second
    # Lens F-Number/F-Stop = 35/10 = F3.5
    # ISO Speed Ratings = 200
    • CommentAuthorCWatters
    • CommentTimeDec 6th 2008 edited
     
    The data I posted earlier suggests they are slightly less bright than a 35W halogen. Looking at the white spots/reflections on the walls I would say there are several downlights probably on a grid about 75-100 cm apart. So I would say yes that image probably is representative.
  4.  
    Hi, the pic is taken with a regular digital camera and Im no professional, but its also on my website so obviously I chose the best one. In fact in this bathroom there are a fair few downlights, the main problem we realised was the darkwood effect tile caused lighting problems around the mirror - for shaving/makeup whatever, which was ameleriorated by taking the mirror to near the ceiling. LIke I have said in previous posts I think this product rocks, the number actual lights seems to be similar to how many halogens would be positioned in a room. This particular bathroom is very well lit. In fact the best lit bedrooms I have have this lighting in. Honestly this product is a proper replacement for halogens - it is not the same as the (still) poor quality you get from LEDS available to replace into standard fittings. The other advantage is that in certain applications you can legally DIY it (with access to a power source) or at least decrease the expense of aparkies.
    I am asking these guys to come in next week and look at every part of my building.
    • CommentAuthorjules
    • CommentTimeDec 7th 2008
     
    I have now got hold of a respondalight sample. They are certainly bright- bright enough I think, although I haven't directly compared them with a 50W halogen. My one concern is the narrow beam angle of 36deg. Shining one on a wall 2.4m away - ie ceiling height - produces a pronounced circle of light about 2.5m diameter, with quite a sharp cutoff. That's a potential issue for general kitchen lighting, which is our interest. Cost wise, saving 40W vs a 50W halogen, 2000h/year use saves you 80kWh or 8 quid a year. Not quite their claimed 2.5 year payback (perhaps directed at commercial 24/7 usage).
    • CommentAuthorhowdytom
    • CommentTimeDec 7th 2008
     
    HotelRefurber,
    So just how many is a "fair few"
    I'm still interested in the product. but would like some idea numbers required.
    tom
  7.  
    I dont have that info directly to hand, I will endeavour to take a photo for you of the ceilings.
    • CommentAuthorPressure
    • CommentTimeDec 17th 2008
     
    Any more news on the Osram 1000 lumen bulb? There's a heap of stories about it winning an award, but nothing about a product coming out...
    •  
      CommentAuthordjh
    • CommentTimeDec 19th 2008
     
    Why is anybody on the greenbuilding forum considering meeting the building regs to be a constraint? Building Regs are there to 'persuade' the worst quartile of builders. Green builders should be aiming way above them, surely?

    In regard to the 40 lumen rule, it's supposed to be a fitting that does NOT permit a lamp that does NOT meet the limit, so I'd argue that morally at least, GX53 is a no go.

    T5 HE triphosphor tubes have at least double the output, are cheaper and more widely available, and there are beautiful fittings as mentioned by Nick or they can be concealed so I don't understand why there's any concern?
    • CommentAuthorCWatters
    • CommentTimeDec 19th 2008 edited
     
    I know where you are coming from but seems others dissagree about GX53..

    http://www.litebulbs.co.uk/category/82/gx53-and-megaman-gx53.aspx

    Quote: "Fittings which accept GX53 light bulbs are fully compliant with Part L of the building regulations"

    Are there other types of lamp with GX53 bases that are > 40 Lumens/Watt?

    Halogen down lights are popular due to the subjective quality of the light they produce. Yes tubes are more efficient but most consumer grade tubes and fittings don't match the quality of light you get from a halogen. I wanted to install some commercial downlights in my kitchen (as used in hotels etc) but couldn't find any that the BCO was happy with. He wanted them certified to Part E1 (sound transmission between rooms in a dwelling)! You can get halogen lamps and consumer grade CFL down lights that meet E1 but I wanted something a bit brighter than a consumer grade CFL. I was looking for something that took one 18W or two 7W PL tubes. Something like these..

    http://www.tlc-direct.co.uk/Products/QMPL7C.html
    http://www.tlc-direct.co.uk/Products/GLAT113E.html
  11.  
    Bit more information - I have actually 7 downlights in the bathroom that I showed, and yes I agree at 7wx7 =49 w that seems like alot of juice. However this is a very big bathroom in question- over 10m2,and like I said the lighting is bordering on the xmas tree level. I do agree that this is not the ultimate answer but it is a start in the right direction, as the bulbs become better they can be replaced - I dont think there is any excuse to delay in any high usage location.

    For me any kind of flouro tube is a non-option, I dont like mercury and I refuse to support it - I intend to phase all mf cfl's out when I have a chance.

    By the way I have been informed by responda light that they could achieve 2x the lumen output per watt right now by buying higher grade LED bulbs at over double the price - this would make each lamp around 50+vat - insurmountable for many?
    •  
      CommentAuthordjh
    • CommentTimeDec 23rd 2008 edited
     
    Posted By: CWattersI know where you are coming from but seems others dissagree about GX53.. ... Quote: "Fittings which accept GX53 light bulbs are fully compliant with Part L of the building regulations" ... Are there other types of lamp with GX53 bases that are > 40 Lumens/Watt?

    I agree there are GX53 lamps that are > 40 l/W but it does seem to me like the rules are being bent.

    Halogen down lights are popular due to the subjective quality of the light they produce. Yes tubes are more efficient but most consumer grade tubes and fittings don't match the quality of light you get from a halogen.

    I think it is mainly people's previous experience with pre-triphosphor lamps and a tendency not to fit multiple, bright enough lamps. Halogens are bright sources even if they only give small pools of light. People like the glitter. I think your idea of using brighter commercial downlighters is a good idea. Presumably you could meet acoustic regs with some sort of cover - perhaps one of the fireproof ones? Or if you have access from above, make a box out of plasterboard or somesuch.

    Personally, we use tubes. My wife actually prefers them - she comes from the tropics - and I don't mind. It's very cheap to fit 'too many' tubes to make sure of the brightness and then just turn off any that are not needed.
    • CommentAuthorCWatters
    • CommentTimeDec 23rd 2008
     
    I thought about covers but my first floor is beam and block and for various reason my ceiling void isn't deep enough. I'm sure the commercial fittings would be ok but my BCO either wanted paperwork or an expensive sound test to prove it.

    He wasn't really happy with a beam and block floor because at the time we built it there wasn't a so called "robust design" standard. I eventually found a B&B floor manufacturer that had done a test. They sent me a copy of their certificate and the BCO was happy. I guess I should have just faked a sound test certificate for the lights :-)
    • CommentAuthorTerry
    • CommentTimeApr 11th 2009
     
    Just bumping this one to the front to see if anybody has any more to add on this topic - have to decide on our lighting PDQ

    HotelRefurber - any chance of the name of your Respondalight suppliers as we cant seem to find the prices you are quoting.
    • CommentAuthorPaul_B
    • CommentTimeApr 13th 2009
     
    Hi Terry,

    REading through this thread I have no info on Respondalight but I would recommend a look at the UltraLeds.co.uk website. I have bought a number of LED units from them (including LED strips under cabinet which work very well). They usually have the most up to date LED units and also give the colour outout, lum of the bulb and angle (something that is very important). For example they have just released the following unit:

    100-240V AC High Power Nichia 5 x 1Watt Single Leds (5 Watt Total)
    Flood Light 120'
    Fully CE & Rohs Approved
    Warm White 3000K (Looks just the same colour as your regular Halogen Bulb)
    440 Lumen (50+ watt standard bulb equiv)
    Glass Lens - Metal Case
    Please note this bulb is 25mm longer than a standard GU10 Bulb but the same diameter 49mm

    http://www.ultraleds.co.uk/u10ww5ngu10-240v-watt-nichia-warm-white-leds-wide-angle-p-2022.html

    I recognise they are not cheap but as cutting edge technology, but you can also find other units that are cheaper with a corresponding output in light

    HTH

    Paul
    • CommentAuthorCWatters
    • CommentTimeApr 13th 2009
     
    I'd dispute that 440L is equivalent to a 50W halogen but otherwise it tlooks interesting.

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