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Discussion in 'Electrics UK' started by securespark, 11 May 2018.

  1. securespark

    securespark

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    Couple of things in here I'm not sure about:
     
  2. ericmark

    ericmark

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    So you remove one distribution unit and replace it with another type tested distribution unit or consumer unit neither which contains any fuse-able links so where was the fuse board?

    The guy is brave, we can always find fault with a job I would not want to work with a video camera running.

    However not sure about fitting LED strip lights? only fitted one, it was a 65W fluorescent, which are no longer made, the 58W works but don't last very long around one year and access was no good to be able to swap whole fitting, so got a BG LED replacement from screwfix, took the ballast out of circuit and it was clear after fitting the light output was well down on the fluorescent, looked at spec and yes 2400 lumen rather than around 5400 from fluorescent, OK can get away will a little less light, but advertised as replacement, energy saving well if you replace a 100W bulb with a 40W bulb it saves energy I suppose, so seems we are entering the dark age.

    I expected not to need to change again in my life time, every other mains LED has just worked and worked and main reason to change was low maintenance. However two years latter, with 18 months of that house was empty, and it failed, non of the flashing first giving warning reaching end of life, worked one day failed the next. Could not believe failed so quick so used block connector to power up, so today fitted a Philips LED instead, not quite £15 penny change. Now 20W and 2000 lumen states equivalent to 100 watt which is a load of bull as even a 58W fluorescent has more than twice the output, and can't really compare with tungsten as there has never been a tungsten option that will go in that fitting.

    I did look at complete fittings, however if only a two year life, want something easy to change. The Philips looks like a glass tube, powered one end like BG one, but nothing to show there is a non illuminated line down the tube, the BG had a flat to show which way around, so ended up wrong way around first time of fitting. It will do for now, but once room is cleared so good access think I will change fitting and return to fluorescent and come out of the dark age.
     
  3. securespark

    securespark

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  4. Notch7

    Notch7

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    Thats a very good price, are they as bright as fluorescent?
     
  5. JohnW2

    JohnW2

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    I guess that depends upon what you compare with what, but it sounds surprisingly good for aqn LED.

    That LED fitting with 2 x 35W (i.e. 70W) 6ft tubes claims to produce 7600 lumens (about 108 lumens per watt). One 70W 6ft tube would give about 5,600 lumens (about 80 lumens per watt). Hence the lumens/watt is substantially greater with the LED fitting, but the two 6 ft LED tubes (claimed 7,600 lumens) will produce considerably less light than two 6ft fluorescents (about 11,200 lumens) - albeit the latter will use twice as much electricity. So you (literally) 'pay your money and make your choice'.

    Kind Regards, John
     
  6. securespark

    securespark

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    I have two in my double garage and they are bright enough for me.
    Previously, I had 2 x 8 foot twin flu.
     
  7. JohnW2

    JohnW2

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    Maybe that is an example of what I recently wrote about 'over-specified' fluorescents ...

    If I recall corrections, 4 x 8ft 100W fluorescents should have produced around 32,000 lumens. Two of the above LED fittings (each 2 x 35W) claims to produce 15,200 lumens. If the latter is adequate, your fluorescents were probably rather OTT!

    Kind Regards, John
     
  8. securespark

    securespark

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    Maybe brand new triphosphor lamps, but these dated back to 1999...
     
  9. JohnW2

    JohnW2

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    I didn't think that 8ft fluorescent tubes had been manufactured for a good few years, and I'm not sure that there were any triphosphor ones - but I've never personally had any dealings with 8ft tubes, so really don't know. I just had it in my mind (from somewhere!) that they were around 8,000 lumens.

    Kind Regards, John
     
  10. ban-all-sheds

    ban-all-sheds

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    They are a total PITA to get into the car to take them to the dump recycling centre...
     
  11. 333rocky333

    333rocky333

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    Afaik towards the end there were Triphospher ones mainly 100watt.
    The early Halophospher were usually prefixed with letter "5" whereas the Triphosphor are prefixed with "8", most sold now are the Triphosphor ones

    http://www.lamptech.co.uk/Documents/FL Colours.htm

    Shows the Lumens per watt for both gas types

    https://www.tlc-direct.co.uk/Produc...MI1Zrhir6A2wIVCrftCh1lXwu7EAAYAyAAEgISPvD_BwE
     
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  12. JohnW2

    JohnW2

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    Where?

    Kind Regards, John
     
  13. ban-all-sheds

    ban-all-sheds

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    There.

    BTW - halophosphor vs triphosphor is nothing to do with the gas, it refers to the fluorescent coating on the inside of the glass tube.
     
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  14. JohnW2

    JohnW2

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    Ah, I obviously knew what link secure was talking about, but somehow missed that column!

    Talking of lumens/watt, I presume that the laws of physics must dictate a theoretical ceiling - does anyone know what it is?
     
  15. ericmark

    ericmark

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    I find the claims don't add up. We are told:-
    1) magnetic ballasts have been replaced with HF electronic versions now.
    2) HF ballast uses less power a 58W tube actually uses just 51W.
    3) HF ballast makes the tube last 30% longer.
    4) HF ballast gives 15% more light.
    5) The old halophosphor tubes have been replaced with the new triphosphor tubes.
    Add this all together and we have a 5 foot single tube fitting using 51W giving out 5980 lumen with a life of 32,000 hours, compared with LED at 70W giving out 7660 lumen and life of 35,000 hours. OK the LED is 6 foot not 5 foot and I don't have the figures for 6 foot off hand, however likely in relation to 5 foot so 63W and 7387 lumen so performance wise about equal.

    Where the LED fails however is end of life whole unit needs changing, where with fluorescent only the tube is changed. There are cases where changing the whole unit is good, I worked in a plant making engines and the cutting oil degraded the plastic on the light fittings so new fitting rather than just a tube change is good.

    However it seems the adverts for LED compare them with halophosphor tubes and magnet ballasts, neither of which are any longer used.
     
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