Options for flicker free lighting source?

You need specialist tubes for specialist use. Domestic ones are more concerned with low cost.

Fluorescents are widely used in TV location work as soft lights and have a good colour spectrum and are fully dimmable - without the temp changing by much. Available in daylight and tungsten.

Reply to
Dave Plowman (News)
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Well a tungsten dimmable tube sounds about what I'm after - could you possibly mention a brand name of tube and drivers, then I can take a deep breath and go off and find out how much they cost.

Many thanks,

Sid

Reply to
unopened

And have been since at least fairly early in the run of Pot Black.

Reply to
Rod

My daughter suffers terribly from this - the lighting actually causes headaches followed by the nauseous feelings you describe. Given that Tungsten lights are being phased out, have you any suggestions as to which lights are acceptable as replacements?

Another Dave

Reply to
Another Dave

Well, I'm no expert, but I can offer some suggestions...

If you use Compact Fluorescent Lamps (CFLs), their operating frequency is in the kilohertz rather than mains frequency or twice mains frequency, so the flicker _shouldn't_ be noticeable. Some people are not particularly impressed with the light quality from CFLs. I've used lots of different ones, and so far I'm quite impressed with GE ecoimagination ones which I got from Tesco. The GE catalogue reference is FLE11TBX/T3/827/E27-10Y-GE. They are 11 Watt, E27 units, but I'm sure bayonet mount are available as well.

Some people use halogen incandescent lamps, which are slightly more efficient than standard incandescents. However, they produce a 'whiter' light than standard incandescents, which is problematic for some people. Some have been produced in GLS format, but GE have recently said they are no longer developing high efficiency halogen lamps, so GLS versions are unlikely to be available in the long term.

Some people continue to use standard tungsten incandescent lamps - if you can't get 100 Watt lamps, buying fittings that allow you to use

2x60 Watt or 3x40 Watt lamps instead can enable you to carry on using the lighting system you prefer.However, it looks like there is forthcoming EU legislation to ban incandescents completely (presumably except for applications where there are no suitable alternatives), so it may not be a long term strategy:

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like Ban the Bulb
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) think this isn't going far or fast enough.

The UK government's voluntary scheme for banning incandescent is detailed in this press release:

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'd say try CFLs, and if your daughter cant cope with those, then hope that LED technology works better for her and becomes cheaper, faster.

Sid

Reply to
unopened

And boxing - I remember seeing a three phase rig to avoid flicker so probably dating from before the days of high frequency ballasts.

Reply to
Dave Plowman (News)

The trouble is that pro lamps such as these cost a fortune - but you could make something similar yourself for a more affordable amount.

Osram do a range of dimmable ballasts :-

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But you'd have to select the tube size/colour temp you want first and how many of them. I'd say most good triphosphor types should be ok.

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Many thanks,

Reply to
Dave Plowman (News)

Regards,

Sid.

Reply to
unopened

Philips Colour 29 (2855K) was a common warm white halophosphate. It had a CRI of 51, although it was very efficient. Better warm white halophosphates appeared such as Softone 32 (with a CRI of 92), but they were only half the efficiency. I doubt they exist anymore.

I have run T5HE tubes under cabinets. They come in lengths which match modular ceiling systems, and which also match most common wall cabinet widths. 35W is the longest, and 14W the shortest. (If you need shorter, the old T5 4/6/8/13W tubes are similar.) I clip them to the rear if the plinth, and mount the control gear somewhere where it won't warm up food stored in the cupboards.

For room lighting, I use the T5HO tubes over cabinets, combined with a brilliant white ceiling to reflect the light back. They come in the same lengths as T5HE, but are over twice the power ratings, up to 80W.

T5HE = T5 High Efficiency T5HO = T5 High Output

Yes. A light in the middle of a kitchen is remarkably useless.

Reply to
Andrew Gabriel

You're welcome. I'm not saying either of the above companies are the best value - but when you choose what you want you can Google for the best price.

Reply to
Dave Plowman (News)

Looks like all perl (frosted) GLS lamps and 100W clear banned from Sep 2009. Then clear 75W, and 60W, and finally all GLS lamps banned in 2010, 2011, and 2012 respectively. Same for most halogen lamps, but some of the highest efficiency ones (which aren't in common use today) will be allowed to remain.

Reply to
Andrew Gabriel

Any reference to this as GE have proudly held on to halogen heritage?

envelopes all round then and display lamps are a special use which includes a lot of MR16s.

Certainly not fast enough , if they think LED is 90% more efficient then they are already living in the future, oh dear.

Reality will bite at some point that other sources, all being phosphor based, are not a panacea, hot wire technology still has some life left in it and offers a continuous spectrum.

Watch out for some wacky "special use " fittings appearing and a black market in non Part L pendant sets ;-)

Adam

Reply to
Adam Aglionby

A Google news (UK) search on "ge hei" gives the following:

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refer to a statement made in the 'Clean Break' blog here:

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"Here=92s the reply I got today from GE spokesman David Schuellerman:

GE Consumers & Industrial and GE Global Research have suspended the development of the high-efficiency incandescent lamp (HEI) to place greater focus and investment on what we believe will be the ultimate in energy efficient lighting =97 light-emitting diodes (LEDs) and organic light-emitting diodes (OLEDs). Research and development of these technologies is moving at an impressive pace and will be ready for general lighting in the near future. LEDs and OLEDs used in general lighting are now poised to surpass the projected efficiency levels of HEI, along with other energy-efficient technologies like fluorescent, and have the additional benefits of long life and durability."

So, I should have been a bit more careful in what I said - development of HEI lamps has stopped.

Regards,

Sid

Reply to
unopened

I should have linked to the 'technical' pdf:

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like the infra-red coated envelope on the halogen design. Pity it is not more popular.

Cheers,

Sid

Reply to
unopened

Thanks very much.

Another Dave

Reply to
Another Dave

,

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I like the infra-red coated envelope on the halogen design. Pity it is

I've only seen it in this country on the 300W and 500W linear halogen tubes (which are then 225W and 375W respectively). It is available in the US on more lamp types, but there's almost no market for efficient halogens in Europe -- people who care about efficiency don't use halogens in the first place, and those who do use halogens don't care about efficiency and won't pay extra up-front cost (not to mention that the IR coating is expensive to apply).

It also only works in a few geometries of halogen lamps. Basically, it needs the IR to be reflected back onto the filament, and reasonably uniformly. It's really only the linear tube halogens where this is effective enough to merit the additional cost of the process. It lifts these mains filament halogens up to a 'C' efficiency rating (and not a 'B' rating as I saw someone say in the other thread).

Reply to
Andrew Gabriel

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