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Old 7th Oct 2020, 7:56 pm   #1
trsomian
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Default Lamp for elderly anglepoise light

I have an elderly anglepoise light, that works perfectly for normal incandescent 60W lamps, but new compact fluorescent and LED lamps are heavier, so it upsets the balance. I have tried adjusting the spring tensions, but can't get the adjustment to go far enough. Has anyone got and ideas, or know of particularly light weight low energy lamps?
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Old 7th Oct 2020, 8:00 pm   #2
mole42uk
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Default Re: Lamp for elderly anglepoise light

I have used halogen lamps in my Anglepoise, I usually have to wind a bit of solder around the stem to make it heavier.
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Old 7th Oct 2020, 8:11 pm   #3
KeithsTV
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Default Re: Lamp for elderly anglepoise light

I recently repaired my old Anglepoise lamp and also found that the normal type of LED bulb was too heavy for it. However I've found that a filament style LED bulb is lighter and allows it to be adjusted just like the old incandescent bulb

Keith
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Old 7th Oct 2020, 8:32 pm   #4
G6Tanuki
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Default Re: Lamp for elderly anglepoise light

Can you not 'nip up' or otherwise shim the pivots to add some extra hysteresis? Must admit, in the days when I had an Anglepoise-esque microscope-lamp I found it rather annoying because over a few hours it would invariably 'creep' from wherever I had positioned it.
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Old 7th Oct 2020, 9:49 pm   #5
barrymagrec
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Default Re: Lamp for elderly anglepoise light

I have this problem with my benchlight which is a former drawing board light. I put a carpentry clamp on the rear strut which helped a lot but perfection was achieved by placing a Hatfield 50 ohm switchable attenuator on top of the clamp.

I appreciate this solution may not be ideal for everyone.
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Old 7th Oct 2020, 10:19 pm   #6
PJL
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Default Re: Lamp for elderly anglepoise light

The LED candle bulbs are lighter.
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Old 7th Oct 2020, 10:36 pm   #7
broadgage
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Default Re: Lamp for elderly anglepoise light

Agree that an LED filament bulb is worth a try, never weighed one, but subjectively they weigh no more than incandescent bulbs.
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Old 8th Oct 2020, 12:18 am   #8
Herald1360
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Default Re: Lamp for elderly anglepoise light

I found that a GU10-bayonet adaptor plus a LED GU10 downlighter bulb work ok for me, thoiugh having checked some weights it would seem that was just luck- the GU10 combo weighs 100g and a 60W GLS tungsten is 30g. A cheap LED GLS bulb is close at 38g.
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Old 8th Oct 2020, 8:02 am   #9
Electronpusher0
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Default Re: Lamp for elderly anglepoise light

I have three old type anglepoise lamps and I find the LED bulbs from Poundland are smaller and lighter and do not upset the balance.

Peter
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Old 8th Oct 2020, 8:49 am   #10
Nickthedentist
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Default Re: Lamp for elderly anglepoise light

Philips LED bulbs work well in mine. The Osram ones are far too heavy.
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Old 8th Oct 2020, 1:41 pm   #11
KeithsTV
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Default Re: Lamp for elderly anglepoise light

I compared the weights of three lamps on our "highly accurate" kitchen scales.

Incandescent approx 40g

LED approx 80g

LED filament approx 37g

The lamp works as expected when either the incandescent or the LED filament, shown in the attachment, is fitted.

Keith
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Old 8th Oct 2020, 2:33 pm   #12
Brigham
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Default Re: Lamp for elderly anglepoise light

Pearl LED filament lamps are available, which give a good representation of a normal tungsten lamp.
I tend to use the original type lamp in 'collectors' type fittings, unless the heat is liable to increase decay of elderly bakelite or rubber.
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Old 8th Oct 2020, 10:13 pm   #13
emeritus
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Default Re: Lamp for elderly anglepoise light

In the British Standard for GLS lamps, two of the things specified for each wattage were bulb diameter and distance of light centre from base. In later prodution, many manufacturers used smaller glass envelopes with a corresponding shift of the light centre towards the base, which affected the beam produced by lamps like the Anglepoise that use a reflector to produce their beam. The last types sold by Tesco proudly proclaimed that using less glass was better for the environment, but as they were about the same size as golfball low wattage bulbs the bases of their 100W bulbs ran much hotter. I too did experiment with LEDs and GU10-based lamps in adaptors and had the same problem with their heavier weights. Fortunately I have more than enough old-style bulbs for my Anglepoises to see me out.
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Old 11th Oct 2020, 11:38 am   #14
John10b
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Default Re: Lamp for elderly anglepoise light

I do what G6tanuki suggests, it’s not perfect but it does the job.
John.
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Old 11th Oct 2020, 11:44 am   #15
poppydog
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Default Re: Lamp for elderly anglepoise light

I had similar issues with anglepoise bulbs, my thread here may help.

https://www.vintage-radio.net/forum/...d.php?t=149487
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Old 11th Oct 2020, 1:24 pm   #16
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Default Re: Lamp for elderly anglepoise light

These are good and very light, if you'll pardon the pun

https://www.ikea.com/gb/en/p/ryet-le...hite-70441284/
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Old 11th Oct 2020, 8:02 pm   #17
trsomian
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Default Re: Lamp for elderly anglepoise light

Thank you all. I bought an LED filament lamp and indeed it balances perfectly. A minor point, but exactly how do these lamps work; from what little I can see it contains no electronics?
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Old 11th Oct 2020, 8:24 pm   #18
DerekG0VDV
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Default Re: Lamp for elderly anglepoise light

Thanks all now I know why my lamp can't keep it's head off the bench since I fitted a low energy bulb and I know what to do to keep it up!
Many thanks again and regards from
Derek G0VDV
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Old 11th Oct 2020, 9:38 pm   #19
Herald1360
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Default Re: Lamp for elderly anglepoise light

Quote:
Originally Posted by trsomian View Post
Thank you all. I bought an LED filament lamp and indeed it balances perfectly. A minor point, but exactly how do these lamps work; from what little I can see it contains no electronics?
None or very little? It could be as little as one capacitor if there are one or two pairs of inverse parallel connected series LED strings.
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Old 11th Oct 2020, 11:56 pm   #20
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Default Re: Lamp for elderly anglepoise light

Those filament LEDs are a later version of one of these.
They were a mains voltage Luxon Star that were on the market for a short time about 10 years ago when LED lamps were very expensive.
You can look through the lens and see the links between 4 60V chains of chips on the die.
These later filament lamps are much easier to see with there clear glass envelopes and very visible chains of chips.
The home made ones with the single die are mostly still soldiering on now at 8 hours a day in some cases. Two failures over 10 lamps over about 8 years aint bad.
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