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  • FIRST POST
    • WobblyDog
    • By WobblyDog 10th Jun 17, 10:15 AM
    • 366Posts
    • 235Thanks
    WobblyDog
    LED filament lamps - are higher power ratings available?
    • #1
    • 10th Jun 17, 10:15 AM
    LED filament lamps - are higher power ratings available? 10th Jun 17 at 10:15 AM
    I've just noticed that Tesco and Asda are selling LED filament lamps with claimed efficiencies above 100 lumens per watt for £3 to £4 each, eg.
    https://www.tesco.com/groceries/product/search/default.aspx?searchBox=led%20filament&icid=tescohp _sws-1_led%20filament.
    I've already bought a couple to replace CFL lamps, I reckon the pay back period will be less than 6 months for heavily used light fittings.

    I have a couple of questions:
    - Are LED lamps with efficiency above 100 lm/W a new thing, or have I just not been paying attention?
    - Has anyone found a source of lamps this efficient that are bright enough to replace 100W incandescent bulbs?
Page 1
    • victor2
    • By victor2 10th Jun 17, 10:44 AM
    • 4,642 Posts
    • 3,086 Thanks
    victor2
    • #2
    • 10th Jun 17, 10:44 AM
    • #2
    • 10th Jun 17, 10:44 AM
    Looks like LED bulbs with that type of output are available:
    http://www.leds4less.co.uk/100w-equivalent-led-bulb--e27-classic-gls-globe--warm-white--integral-479-p.asp
    If your cheaper Tesco ones do indeed give light matching old incandescent 100W bulbs, then that seems like a good deal.
    Of course it's close to impossible for Joe Public to accurately measure the light output, so you have to take the specs provided as true....
    • firefox1956
    • By firefox1956 10th Jun 17, 11:52 AM
    • 1,037 Posts
    • 571 Thanks
    firefox1956
    • #3
    • 10th Jun 17, 11:52 AM
    • #3
    • 10th Jun 17, 11:52 AM
    I have used this company many times.
    Lots of useful info there as well.
    https://www.ledhut.co.uk/
    HTH
    • Strider590
    • By Strider590 10th Jun 17, 1:01 PM
    • 11,167 Posts
    • 6,207 Thanks
    Strider590
    • #4
    • 10th Jun 17, 1:01 PM
    • #4
    • 10th Jun 17, 1:01 PM
    LED bulbs are failing left right and centre, they're pretty much all made in China for China voltages (220v AC), the UK has mains voltage of 230v +10% or -6%.

    All they do is put mains voltage through a bridge rectifier and smoothing circuit to get over 300v DC to drive the LEDs, they then split that voltage across many LEDs in series (each LED needing around 3 volts), so around 100 LEDs per "bank", it's carefully balanced thing, over voltage slowly kills the LEDs by driving them slightly too hard and once one blows, it either goes open circuit (killing the whole bulb) or it goes short circuit (which then increases the voltage on the remaining LEDs).

    My mains voltage is typically 245 in the daytime and 252 at night, i've recorded it reaching 257v on rare occasions, LED bulbs last me about 6-9 months and given the cost versus CFL, they're a complete waste of money.

    I do like LED lights, my garage is fully lit using LEDs, but they all run on 12v DC, supplied by the same heavy duty (10amp capable) 12v power supply that runs my CCTV system.
    Last edited by Strider590; 10-06-2017 at 1:06 PM.
    Having the last word isn't the same as being right.......

    "Never confuse education with intelligence"
    • Jonesya
    • By Jonesya 10th Jun 17, 5:34 PM
    • 1,242 Posts
    • 775 Thanks
    Jonesya
    • #5
    • 10th Jun 17, 5:34 PM
    • #5
    • 10th Jun 17, 5:34 PM
    LEd filament - 1500 lumens, dimmable but pricier @ £13

    http://www.toolstation.com/shop/p45676?table=no

    If your after E27/ES bulbs - can now get LED lamps equivalent to 150W - 2400lumens:
    https://www.bltdirect.com/osram-parathom-pro-20w-frosted-es-gls-150w-alternative-very-warm-white
    • theonlywayisup
    • By theonlywayisup 10th Jun 17, 5:56 PM
    • 10,464 Posts
    • 7,039 Thanks
    theonlywayisup
    • #6
    • 10th Jun 17, 5:56 PM
    • #6
    • 10th Jun 17, 5:56 PM
    LED bulbs are failing left right and centre, they're pretty much all made in China for China voltages (220v AC), the UK has mains voltage of 230v +10% or -6%.

    All they do is put mains voltage through a bridge rectifier and smoothing circuit to get over 300v DC to drive the LEDs, they then split that voltage across many LEDs in series (each LED needing around 3 volts), so around 100 LEDs per "bank", it's carefully balanced thing, over voltage slowly kills the LEDs by driving them slightly too hard and once one blows, it either goes open circuit (killing the whole bulb) or it goes short circuit (which then increases the voltage on the remaining LEDs).

    My mains voltage is typically 245 in the daytime and 252 at night, i've recorded it reaching 257v on rare occasions, LED bulbs last me about 6-9 months and given the cost versus CFL, they're a complete waste of money.

    I do like LED lights, my garage is fully lit using LEDs, but they all run on 12v DC, supplied by the same heavy duty (10amp capable) 12v power supply that runs my CCTV system.
    Originally posted by Strider590
    Blimey that was too technical for me. We changed our old GU10 for LED in 2013 and touch-wood we haven't had a single failure. Looking at the emailed receipt we got them from ledstop.co.uk I have no idea if they still exist...the make of the LED was Kosnic.
    • missile
    • By missile 10th Jun 17, 6:40 PM
    • 8,722 Posts
    • 4,189 Thanks
    missile
    • #7
    • 10th Jun 17, 6:40 PM
    • #7
    • 10th Jun 17, 6:40 PM
    We replaced GU10, 50W halogen with CFL then LEDs which are much brighter.

    CFLs take a while to reach brightness. CFLs and LEDs from genuine EU manufacturers last and give good output.

    Beware cheap Chinese imports which fail prematurely, give poor light and nowhere near the lumen output.
    Last edited by missile; 10-06-2017 at 6:46 PM.
    "A nation's greatness is measured by how it treats its weakest members." ~ Mahatma Gandhi
    Ride hard or stay home
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