12-01-2016, 10:58 AM
(This post was last modified: 12-01-2016, 11:00 AM by ppppenguin.)
My gues is that they will struggle with longevity. Conventional fluorescent and CFL should give 10000+ hours. LED should give 25000+ hours The don't always do so, mainly due to failures in the electronics. But this thing is a hot filament. If you want a decent colour temperature it's got to run at 2700K to 3000K which means an inherently limited life. I don't know if these special coatings prevent the tungsten evaporating, or whether they are compatible with the halogen cycle which redeposits the tungsten on the filament instead of the glass of the bulb.
It looks like it's a fairly thick filament which means low voltage. This inherently gives better efficiency and longer life. a 50W 12V MR16 halogen is more reliable and brighter than its 240V GU10 equivalent. GU10 halogens often have an appallingly short life, possibly due to fractionally high mains voltage. An old fashioned 230V 100W GLS bulb gives out about 1300lm, its 120V US equivalent is nearer 1600lm.
If you need the colour rendering and dimmability of conventional bulbs then the modern "direct replacement" 230V halogens are excellent. I have some 105W halogens whose bulb is the same size as a good old 100W GLS. The light output is close to an old 150W GLS and the colour is nicer too. They're on dimmers, rarely run at full whack and will probably last for long time. Maybe I'll treat myself to some trailing edge dimmers to get rid of the buzz.
This would do for my lounge. You've got to laugh at the bullet point: "Trailing edge technology"
http://www.screwfix.com/p/varilight-trai...w-va/80739
It looks like it's a fairly thick filament which means low voltage. This inherently gives better efficiency and longer life. a 50W 12V MR16 halogen is more reliable and brighter than its 240V GU10 equivalent. GU10 halogens often have an appallingly short life, possibly due to fractionally high mains voltage. An old fashioned 230V 100W GLS bulb gives out about 1300lm, its 120V US equivalent is nearer 1600lm.
If you need the colour rendering and dimmability of conventional bulbs then the modern "direct replacement" 230V halogens are excellent. I have some 105W halogens whose bulb is the same size as a good old 100W GLS. The light output is close to an old 150W GLS and the colour is nicer too. They're on dimmers, rarely run at full whack and will probably last for long time. Maybe I'll treat myself to some trailing edge dimmers to get rid of the buzz.
This would do for my lounge. You've got to laugh at the bullet point: "Trailing edge technology"
http://www.screwfix.com/p/varilight-trai...w-va/80739
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
