Has anyone made any night lights with Luxeon LED's yet?

In article <Xns98EFE1808B8B7Mama@216.196.97.142>, Big Mama Bear wrote:
Has anyone made any night lights with Luxeon LED's yet?

I have yet to see any. Luxeons and their ilk require really low voltage
at rather high current.
Consider sticking a Luxeon on a "wall wart" and adding appropriate
current limiting. Chances are that losses will be high.
I give fair prospects for matching the luminous output of a 7-watt
incandescent with 3-3.5 watts or the output of a 4-watt incandescent with
2-2.5 watts or so. However, it appears to me that the retail price of
such a thing is not just yet quite low enough to make such a nightlight in
place of an incandescent one a better investment than tossing the extra
$-$$ into any stock index mutual fund that you should probably have.

Has anyone made any night lights with Luxeon LED's yet?

--
- Mama Bear

On 11 Mar, 05:09, Big Mama Bear <BigMamaB...@No-Spam.noo> wrote:
Has anyone made any night lights with Luxeon LED's yet?

--
- Mama Bear

I am not sure why you ask specifically about Luxeon's but led
nightlights are manufactured in some quantity and in a variety of
styles by a number of manufacturers.

Luxeons would be much brighter with just a single LED.

And as for the power conversion, why not just drive them with a
capacitive reactance for reducing the line voltage, then rectify it and
filter it?

The main reason I want an LED luxeon night light is because the darn
filaments break in incandescent bulbs, about once every few months,
when you walk by them and it causes vibration. That's great for the
light bulb sellers but way to expensive for me.

Victor Roberts <xxx@lighting-research.com> wrote :

On Sun, 11 Mar 2007 05:41:54 +0000 (UTC), don@manx.misty.com
(Don Klipstein) wrote:

In article <Xns98EFE1808B8B7Mama@216.196.97.142>, Big Mama Bear
wrote:
Has anyone made any night lights with Luxeon LED's yet?

I have yet to see any. Luxeons and their ilk require really low
voltage
at rather high current.
Consider sticking a Luxeon on a "wall wart" and adding appropriate
current limiting. Chances are that losses will be high.
I give fair prospects for matching the luminous output of a 7-watt
incandescent with 3-3.5 watts or the output of a 4-watt incandescent
with 2-2.5 watts or so. However, it appears to me that the retail
price of such a thing is not just yet quite low enough to make such a
nightlight in place of an incandescent one a better investment than
tossing the extra $-$$ into any stock index mutual fund that you
should probably have.

Actually night lights are one of the better replacement
options for LEDs.

A 7-watt, 3000-hour night light lamp produces only 36 to 45
lumens, depending upon whether it is clear or coated.

A 4-watt, 3000-hour, clear night light lamp produces 16
lumens.

A single Luxeon Star produces a minimum of 30.6 lumens
(45 lumens typical) at a junction temperature of 25C and an
input power of 1.2 watts. Even at a more realistic junction
temperature of 80C the minimum output would still be 24
lumens. (This is based on their March 2006 data sheet, so
current performance may be better.)

A capacitive dropping circuit, as Clive has described many
times, would seem to make a high efficiency driver.

All that being said, for a 120-volt or 240-volt nigh light
application I would probably use multiple 20 ma LEDs wired
in series instead of one 350 ma Luxeon.

What about using a small transformer?

The main reason I want an LED luxeon night light is because the darn
filaments break in incandescent bulbs, about once every few months, when
you walk by them and it causes vibration. That's great for the light
bulb sellers but way to expensive for me.

Victor Roberts <xxx@lighting-research.com> wrote :

On Sun, 11 Mar 2007 05:41:54 +0000 (UTC), don@manx.misty.com
(Don Klipstein) wrote:

In article <Xns98EFE1808B8B7Mama@216.196.97.142>, Big Mama Bear
wrote:
Has anyone made any night lights with Luxeon LED's yet?

I have yet to see any. Luxeons and their ilk require really low
voltage
at rather high current.
Consider sticking a Luxeon on a "wall wart" and adding appropriate
current limiting. Chances are that losses will be high.
I give fair prospects for matching the luminous output of a 7-watt
incandescent with 3-3.5 watts or the output of a 4-watt incandescent
with 2-2.5 watts or so. However, it appears to me that the retail
price of such a thing is not just yet quite low enough to make such a
nightlight in place of an incandescent one a better investment than
tossing the extra $-$$ into any stock index mutual fund that you
should probably have.

Actually night lights are one of the better replacement
options for LEDs.

A 7-watt, 3000-hour night light lamp produces only 36 to 45
lumens, depending upon whether it is clear or coated.

A 4-watt, 3000-hour, clear night light lamp produces 16
lumens.

A single Luxeon Star produces a minimum of 30.6 lumens
(45 lumens typical) at a junction temperature of 25C and an
input power of 1.2 watts. Even at a more realistic junction
temperature of 80C the minimum output would still be 24
lumens. (This is based on their March 2006 data sheet, so
current performance may be better.)

A capacitive dropping circuit, as Clive has described many
times, would seem to make a high efficiency driver.

All that being said, for a 120-volt or 240-volt nigh light
application I would probably use multiple 20 ma LEDs wired
in series instead of one 350 ma Luxeon.

What about using a small transformer?

The main reason I want an LED luxeon night light is because the darn
filaments break in incandescent bulbs, about once every few months, when
you walk by them and it causes vibration. That's great for the light
bulb sellers but way to expensive for me.
--
- Mama Bear

Light/health research now indicates that blue wavelengths -- even at
relatively low levels -- can suppress natural night time melatonin
levels and perhaps reduce sleep quality.

The main reason I want an LED luxeon night light is because the darn
filaments break in incandescent bulbs, about once every few months, when
you walk by them and it causes vibration. That's great for the light
bulb sellers but way to expensive for me.

In message <QJZIh.57103$as2.45857@bgtnsc05-news.ops.worldnet.att.net>, TKM
noname@no.net> writes
Light/health research now indicates that blue wavelengths -- even at
relatively low levels -- can suppress natural night time melatonin levels
and perhaps reduce sleep quality.

Is this just quackery or is it true though.

--
Clive Mitchell
http://www.bigclive.com

Evidence is accumulating. Several researchers in various countries
have found the effect which involves a different neural pathway than
vision. An important question, however, is the dose -- how much light,
what color, when applied, etc.

In message <Xns98F06DE63F555Mama@216.196.97.142>, Big Mama Bear
BigMamaBear@No-Spam.noo> writes
The main reason I want an LED luxeon night light is because the darn
filaments break in incandescent bulbs, about once every few months,
when you walk by them and it causes vibration. That's great for the
light bulb sellers but way to expensive for me.

You get plug-in LED night lights with between one and five 5mm LEDs
in them. That might not sound much, but at night it's bright.

The other option might be a small desk lamp that takes a GU10 and put
an LED lamp in it.

Or just install a GU10 downlighter with an LED lamp and have a 24
hour nite-lite.