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From: Paul Hovnanian P.E. on 29 Jul 2010 14:07
I'm looking for a couple of these to repair some (antique) equipment. They
should be 1.5V, about 30mA and produce a relatively 'white' light at this
current. Some Radio Shack 6V, 100mA bulbs draw approximately the correct
current at 1.5V, but they are too reddish and dim to be of any use.

These are used in an old photographic light meter as a null indicator. LEDs
won't work at this voltage level (too dim and no where near linear
brightness vs voltage).

--
Paul Hovnanian paul(a)hovnanian.com
----------------------------------------------------------------------
Have gnu, will travel.
From: Dave Platt on 29 Jul 2010 14:20
In article <Noadne83-tm2XszRnZ2dnUVZ_sKdnZ2d(a)posted.isomediainc>,
Paul Hovnanian P.E. <paul(a)hovnanian.com> wrote:

>I'm looking for a couple of these to repair some (antique) equipment. They
>should be 1.5V, about 30mA and produce a relatively 'white' light at this
>current. Some Radio Shack 6V, 100mA bulbs draw approximately the correct
>current at 1.5V, but they are too reddish and dim to be of any use.
>
>These are used in an old photographic light meter as a null indicator. LEDs
>won't work at this voltage level (too dim and no where near linear
>brightness vs voltage).

First Googling turns up some bulbs offered by Kit Kraft, for dollhouse
use: http://www.kitkraft.biz/product.php?productid=5582

Stated as 1.5 - 3 volts, current draw not stated.

--
Dave Platt <dplatt(a)radagast.org> AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!
From: Piotr Piatek on 29 Jul 2010 17:17
On Thu, 29 Jul 2010 11:07:21 -0700, "Paul Hovnanian P.E." wrote:

>I'm looking for a couple of these to repair some (antique) equipment. They
>should be 1.5V, about 30mA and produce a relatively 'white' light at this
>current.

You could cannibalize a cheap LCD watch. They use tiny 1.5V bulbs to
backlit the display.

Piotr

From: Grant on 29 Jul 2010 17:47
On Thu, 29 Jul 2010 11:07:21 -0700, "Paul Hovnanian P.E." <paul(a)hovnanian.com> wrote:

>I'm looking for a couple of these to repair some (antique) equipment. They
>should be 1.5V, about 30mA and produce a relatively 'white' light at this
>current. Some Radio Shack 6V, 100mA bulbs draw approximately the correct
>current at 1.5V, but they are too reddish and dim to be of any use.
>
>These are used in an old photographic light meter as a null indicator. LEDs
>won't work at this voltage level (too dim and no where near linear
>brightness vs voltage).

If you could add an opamp for voltage to current, you might be able to
use a LED. Otherwise more shopping around, perhaps hobby model shops?

Grant.
From: Archon on 29 Jul 2010 19:05
On 7/29/2010 2:07 PM, Paul Hovnanian P.E. wrote:
> I'm looking for a couple of these to repair some (antique) equipment. They
> should be 1.5V, about 30mA and produce a relatively 'white' light at this
> current. Some Radio Shack 6V, 100mA bulbs draw approximately the correct
> current at 1.5V, but they are too reddish and dim to be of any use.
>
> These are used in an old photographic light meter as a null indicator. LEDs
> won't work at this voltage level (too dim and no where near linear
> brightness vs voltage).
>

Ebay #> 120598027723

Have to hack the cute lampshades off maybe?
JC
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