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  Reply # 622140 9-May-2012 11:57
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Article up on BBC News today LED light bulb to last more than 20 years

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  Reply # 623023 10-May-2012 17:10
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Why do they state "DIMMABLE" on the Viribright packaging when they won't work with any standard dimmer.

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  Reply # 623026 10-May-2012 17:14
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Not tried it yet, what happened when you tried it?




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  Reply # 623030 10-May-2012 17:20
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it simply means it is possible to dim the light, you could equally say the dimmer was not able to be called a dimmer unless it were compatible with every light of that voltage on the market couldn’t you ? ;)

I think it is more the way related items are out of step , maybe older dimmers were never made to suit bulbs that did not exist.

If i made a bulb i would not compromise the light output or efficiency to suit a particular style of dimmer, i would make the best bulb i could with the resources and knowledge i had and let dimmer makers catch up with the times.

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  Reply # 623150 10-May-2012 19:39
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richms: Not tried it yet, what happened when you tried it?


With no other load, it flashes rapidly and with additional incandescent load on the circuit, the Viribright dims but has bugger-all range (still very bright at minimum).

Jimmy22: it simply means it is possible to dim the light, you could equally say the dimmer was not able to be called a dimmer unless it were compatible with every light of that voltage on the market couldn’t you ? ;)

I think it is more the way related items are out of step , maybe older dimmers were never made to suit bulbs that did not exist.

If i made a bulb i would not compromise the light output or efficiency to suit a particular style of dimmer, i would make the best bulb i could with the resources and knowledge i had and let dimmer makers catch up with the times.


I get what you are saying, but it should be more specific on the packaging. It just says "DIMMABLE". The average consumer will probably see "DIMMABLE" and a bulb with a standard connector and assume that it should work with their standard dimmer.

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  Reply # 623164 10-May-2012 19:50
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Oubadah, do you know what type of dimmer you have? Any model number? There are a number of different types.

By the way, I've confirmed the LEDs are blue (which then radiates phosphor to generate a clean white).




You can never have enough Volvos!




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  Reply # 623220 10-May-2012 21:47
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Niel: Oubadah, do you know what type of dimmer you have? Any model number? There are a number of different types.

By the way, I've confirmed the LEDs are blue (which then radiates phosphor to generate a clean white).


It's one of the two current PDL ones, can't remember if it was trailing edge or leading edge. I have a feeling it was 40w minimum, so I was never expecting it to work with just one 8w lamp attached.

EDIT: Models same as those featured in this thread: http://www.geekzone.co.nz/forums.asp?forumid=34&topicid=77260&page_no=2

networkn: http://www.engadget.com/2012/05/09/ges-27-watt-led-replacement-for-100-watt-incandescent-bulbs-set/


That looks like Saruman's staff or something.

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  Reply # 623692 11-May-2012 19:23
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networkn: http://www.engadget.com/2012/05/09/ges-27-watt-led-replacement-for-100-watt-incandescent-bulbs-set/


100W replacement? 1600+ lumens is more like a 150W incandescent. ~60 lm/W is only just OK, but so much light from such a small bulb is fantastic.

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  Reply # 623720 11-May-2012 20:27
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Remember the considerably higher efficiancy of lower voltage incandesent lighting gives the US about 20% more lumans per watt than you see on 240v lamps. A 23-24w cfl equals a 100 w 110 v lamp but is usually rated at 125w in 230 v countries




Richard rich.ms

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  Reply # 625120 14-May-2012 21:51
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Still no more stock of the 8W ES cool white at bunnings wairau. Might have to see if I can get up to constalation after work before they close.

Bloody good lights in the recesssed downlights. Now have my room lit for 24w vs the 69w it was on CFLs and barely notice any difference in the room. Tops of the walls seem a little dimmer because the light is higher up in the recessed cans but that means less light on the TV ;)




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  Reply # 625207 15-May-2012 06:05
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So far I've got only 4x Viribright ES 8W and they are great, but one is going back because of a dead LED cluster (there are 6 clusters). To check, use sunglasses and see if all 6 LED clusters are on. The faulty cluster sometimes springs to life for a brief moment and I see the flash of light reflected off walls.




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  Reply # 625322 15-May-2012 10:19
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timmmay: Downlights are a really bad plan for energy efficiency. They let so much heat out the power saved by using LED over incandescent is almost irrelevant. If you put eight downlights in a room, even sealed downlights, you'll need to put 2-3 times more heat into the room to keep it a comfortable temperature. That's up to triple the energy costs.


You weren't exagerating. I've only just come across these measurements done on behalf of EECA.

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  Reply # 625330 15-May-2012 10:26
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That's exactly the test I was talking about. Who cares if you save 40W if you have to use an extra 2kw to heat the room?

I hope RightLight got permission to copy that article.




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