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Housing - New Build: LED lights

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      CommentAuthordjh
    • CommentTimeOct 27th 2014
     
    Posted By: atomicbisfWell almost all the light from the LEDs is directed downwards, but a linear fluorescent emits through 360 degrees of the tube so you need a reflector fitting.

    Ah, I understand what you mean. Agreed. When actually used under cupboards, it makes a noticeable difference to stick reflective foil under the cupboard.

    I'm a little skeptical that it is actually using 36 W as it is barely warm to the touch, while a fluorescent lamp would get pretty warm.

    It may just be designed that way. LEDs work better if they're kept cool, whilst fluorescents are designed to heat the tube to about 25 °C to improve efficiency.
    • CommentAuthorMikel
    • CommentTimeOct 30th 2014
     
    We've now had a few months experience with G4 LED replacement bulbs.

    We used these in our kitchen which has under unit, cabinet lighting and cooker hood lighting and in our lounge.

    We used 10X G4 2W SMD LED Bulb DC12V G4 led lamp SMD LED Light Bulb Super Bright G4 led 180-200LM Warm White, ordered from Amazon @ £1.89 each. These have been OK, with one flickering in the cooker hood requiring replacing. A couple of G4 halogens are left in as this works better with the original transformers.

    The MiEco G4 LED Bulb 1.5 Watt Cree 12V Warm White seem reliable but have a very directional light and not too bright. Also they are more expensive @£5 per bulb (Amazon).

    Our lounge lighting is the real challenge, with 5 wall lights each with 3 20W G4 halogens and a centre light with 18 G4 halogens. Th MiEco were not at all suitable here.

    Lounge lighting is shown in the picture http://www.oceanlighting.co.uk/ceiling-lights-c1/eglo-87939-romance-light-modern-ceiling-p2679

    We used G4 1.5W LED Bulb DC12V 1.5W G4 led lamp,3014 SMD LED Light Bulbs,12V G4 spotlight bulbs in crystal lamp,Super Bright G4 led ,Warm White. These are thin G4 LEDs with 12 small LEDs giving an all round light. The LEDs are mounted in a cross format and covered with what looks like transparent silicone and slightly spongy to touch. The cost worked out @£1 per bulb (Amazon).

    These are mounted in the wall lights replacing 2 out of 3 G4 halogens and in the ceiling light replacing 14 out 18 G4 halogens. Found by experimentation that leaving one G4 halogen per wall light gave a good light and balanced out the appearance with differing light colours.

    In terms of usage, we don't use the wall lights much and there have been no failures here. The ceiling light has daily usage and there have been a few failures with more on the way.

    So, to sum up, we are not there yet with these G4 replacements for our lounge lighting.
    • CommentAuthoratomicbisf
    • CommentTimeNov 5th 2014 edited
     
    Anyone in or around Bath may be interested in Transition Bath's LED Halogen Replacement Lighting Project: http://transitionbath.org/ledlighting.

    We have a wide variety of LED lamps to replace halogen downlighters in different colour temperatures and brightnesses which can be borrowed, the idea being that you can chose the type you like before you buy. I believe they are from the mid-low end of the pricing scale so they won't be super-expensive or the really cheap but variable no-name types.

    Ed
    • CommentAuthorCWatters
    • CommentTimeNov 6th 2014 edited
     
    Two things I learnt when replacing my halogen downlights...

    1) Comparing ONE LED with ONE halogen is a waste of time unless the beam angles are the same. Some LEDs have a much wider or much narrower beam angle. Sometimes this makes the LED look brighter or dimmer when in reality it's outputting the same amount of light or even more.

    2) 230V GU10 halogens and 12V MR16 halogens are not the same brightness and are sometimes installed on different spacing to give the same light level. If you replace both with the same LED the people with GU10s might be happy with the end result while the people with M16 are unhappy.
    • CommentAuthorrhamdu
    • CommentTimeNov 6th 2014
     
    Posted By: atomicbisfWe have a wide variety of LED lamps to replace halogen downlighters in different colour temperatures and brightnesses which can be borrowed, the idea being that you can chose the type you like before you buy.


    Excellent idea. Overcomes one of the main impediments to faster take-up of LEDs.
  6.  
    Another issue I feel is that people still compare in watts when this has no impact on the output of the bulb. You mention lumens and they are instantly confused. Efficiency has a huge part to play. Cheaper LED's tend to have lower lumen value and in my testing the cheaper units tend to fail on a regular basis. Replacing LED's on a regular basis is neither green or fun.
  7.  
    Posted By: gustyturbineCheaper LED's tend to have lower lumen value
    you mean lower value per Watt....
    • CommentAuthoratomicbisf
    • CommentTimeNov 6th 2014 edited
     
    Posted By: rhamdu
    Posted By: atomicbisfWe have a wide variety of LED lamps to replace halogen downlighters in different colour temperatures and brightnesses which can be borrowed, the idea being that you can chose the type you like before you buy.


    Excellent idea. Overcomes one of the main impediments to faster take-up of LEDs.


    I think so too. If people have halogen downlighters they tend to have a lot of them so there's a potential to save a lot of energy quite easily. The kit should be in Bath library soon and available to borrow like a book.

    Ed
    • CommentAuthorborpin
    • CommentTimeNov 6th 2014
     
    As I said before, once you find a bulb you like buy lots of spares as an absolute certainty is that when one goes, you will not be able to buy an exact match.
  10.  
    Gotanewlife- Yes per watt. I felt that was obvious. :bigsmile:
  11.  
    Sure but we're not the only ones that read the GBF....as you said:

    Posted By: gustyturbineYou mention lumens and they are instantly confused.

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