High capacity low energy bulbs

[Timothy Murphy]

Can I get a low energy bulb equivalent to say a 200 watt incandescent? (I don't think I've even seen 100 watt equivalent.)

[Owain]

A 70W sodium was an acceptable replacement for 500W halogen in my back garden.

As the max BC GLS bulb is 150W IIRC what sort of fitting are you using?

Owain

[Andrew Gabriel]

There's about a factor of 4 between a filament lamp power and a compact fluorescent at same light output. Ignore the equivalent stated on the packaging -- that's compared against a softtone filament lamp, which isn't what most people use. This would imply you need a 50W CFL. However, mains filament lamps get more efficient at higher power, i.e. a 200W lamp will give off more than twice the lumen output of a 100W lamp, so if you really want to match a 200W lamp, you will probably need even more than 50W CFL.

The highest I've seen in a standard UK retail outlet is 30W in Homebase, but ES base only. Higher power ones are available in the US, but they can only be used base-down, as the heat from the tube quickly cooks the electronics otherwise.

They do exist -- you're looking for a 25W CFL. I have an Omicron one in front of me at the moment. In R80 floodlamp format, there's the 23W GE Genura -- it's expensive but uses a different technology and generates more light than a 100W R80, and it's life isn't reduced by frequent switching on and off.

[Dave Plowman (News)]

If you want to simply plug one in, probably not. But there are other types of high efficiency lamps which will give the equivalent of 200 watts - and a great deal more. They're just not self contained replacements.

[Andy Wade]

What about a 38 W 2D? Output is about 2500 lumens, which will be similar to 200 W of GLS.

[Dave Fawthrop]

|Can I get a low energy bulb equivalent to say a 200 watt incandescent? |(I don't think I've even seen 100 watt equivalent.)

I have a 23watt, (120) low energy bulb over the stairs, but have never seen another.

I have several long, thin flourescents equivalent to 200W incandescents.

[Timothy Murphy]

Thanks for all the responses.

It is a standard bayonet-type fitting, but I'd happily change to screw-in (or any other) if necessary.

I don't currently have a 200w bulb in it; I have a 75w equivalent low-energy bulb. But I'd like it to be much brighter.

On other responses:

(1) "What about a 38 W 2D? Output is about 2500 lumens, which will be similar to 200 W of GLS."

What is a 2D, please?

(2) " The highest I've seen in a standard UK retail outlet is 30W in Homebase, but ES base only."

What is "ES base"?

[Pete C]

Try:

cheers, Pete.

[David Hansen]

On Thu, 13 Jul 2006 11:10:52 +0100 someone who may be Timothy Murphy wrote this:-

Then I suggest you change the fitting to something designed for that sort of thing.

If it is to be left on for long periods then get a high pressure sodium fitting, if it is not get a linear halogen fitting.

[chris French]

In message , Dave Fawthrop writes

They are easily available, just not in sheds, on the high street etc.

I have a 45W BC CFL in the hallway. Bought from Eurobatteries, though a quick search for 'Light bulbs' etc. soon turns up other suppliers as well

Though I can't now see it there (they have a ES one, mine is BC) But different suppliers seem to ahev different mixes of Wattage and base type.

anyway, this and higher wattage are available.

[mike]

Timothy Murphy wrote in news:l_otg.11405$ [e-mail]:

2D's appear to be these

(it wraps after the Lew-)

So it looks as if you need a pearper fitting for them

mike

[Andrew Gabriel]

A GE 240V 200W GLS is 3020 lumens (although no longer available AFAIK).

It's a compact fluorescent format invented by Thorn Lighting (now absorbed into GE Lighting) with a tube bent into a square with rounded corners, like 2 D's back to back. However, they need special lampholders and an external ballast.

Edison Screw.

[Frank Erskine]

On Thu, 13 Jul 2006 11:10:52 +0100, Timothy Murphy had this to say:

The largest is "GES" which is Goliath Edison Screw, usually used for lamps of some 500W or thereabouts.

"ES" is Edison Screw, the nearest functional equivalent to the British "Bayonet Cap" (BC).

"SES" is Small Edison Screw, often used for lower wattage devices like table lamps, picture lamps, and so on.

"MES" is Miniature Edison Screw - the traditional "torch bulb" size, and

"LES" is Lilliput Edison Screw, used for such things as panel lamps for electronic thingies, 70s-style Christmas-tree lights, et al.

There are other ES-type lamp fittings for specialist lamps such as those for microwave ovens and so on.

[Andy Wade]

Surprisingly high. Mind you, is that "initial lumens" or "lighting design lumens" (LDL)? I couldn't find any figures for 200 W GLS when I posted that last night - I was just scaling up from 100 W being around

1200 LDL (IIRC). So the 200 W lamp achieves ~15 lm/W, and the 100 W only 12 lm/W. I suppose that reinforces the point you've often made about the better efficiency of the stouter filament...

[Guy King]

The message from Frank Erskine contains these words:

Does anyone else use BC?

[Andrew Gabriel]

French sales are 50/50 BC/ES, apparently (I saw in EU published figures). Don't know about Ireland, who tend to follow UK in electrical issues.

[meow2222]

CFLs upto 105 watts, plus coloured CFLs. Not competitive for ordinary cfls tho.

Theres a pic on the net somewhere of someones homemade 200w cfl (or something like that), he took a plastic ball, added a dozen or so bulbholders and filled em.

NT

[meow2222]

anyone tried bending an 8' tube into a spiral? :)

NT

[Andrew Gabriel]

That would be Clive Mitchell...

[meow2222]

NT