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Typically low voltage halogen units (MR16) are between 12
and 40
degrees depending on whether you bought spot or flood. Not sure about the
mains
ones off the top of my head.
Cheers,
Rich.
-----Original Message-----
From:
Nikola
Kasic [mailto:nikola@xxxxxxx]
Sent: 16 September 2002
11:56
To: ukha_d@xxxxxxxSubject: RE: [ukha_d]
lens's / holders / whatever you may call them
Richard,
What's the angle in normal, recessed halogen
light?
I
would like to know how many white LEDs I need to get equivalent of 50W
halogen
light.
We
need to find lumen details somewhere, probably on the packaging
box.
Cheers,
Nik
Candelas are lumens per steradian, so to convert
between lumens and candela you need to know the angle the beam of light
spreads over in steradians. The equation is:
lumens = candela *
angle_in_steradian
Apparantly to approximately convert degrees to steradian, multiply
the square of the angle by 0.00024
So, for a 9000mcd 18 degree LED, I calculate 0.7
lumens
I'd be interested to know how many lumens your lamps are rated at,
and what beam angle they have, just to see if theory vaguely intersects
with reality :o)
Cheers,
Rich.
Thanks Tim,
Fitting 18 Leds in a halogen fitting will not be easy. And it's
still just 20W equivalent.
But I will not ditch idea yet. I think that they are constantly
developing stronger and stronger leds.
Do you have an idea how Candelas transform into
lumens?
I have som light bulbs at home which are rated in lumens. What's
mesured in Lumens and what in Candelas?
Cheers,
Nik
Hi Nik,
I read on one of the (many) LED sites that 18 LEDs are equivalent
to a 20W halogen. It was all very vague since it didn't state the type
of LEDs, their mcd rating, viewing angle etc, all of which will make a
difference in how the light is "delivered" from the
fitting.
I'll let you know if we come up with anything worth "publishing"
;-)
Cheers,
Tim H.
-----Original
Message-----
From: Nikola Kasic
Please, let me know if any of your ideas materialize. I would
like to buy a white LED array (10 leds) and put it in LV halogen
fitting, but I am not sure if they can generate enough
light.
If you make anything like that let me know if it can be
compared to normal halogen bulb.
Cheers,
Nik
A mate & I have been talking about this
for a little while. One idea we liked was taking the surround from a
mains or LV halogen fitting (the bit that fits into the ceiling) and
replacing the normal bulb with a circular piece of plexiglass,
drilled with a number of holes to suit the OD of the LEDs.
There's a number of other options / variations, such as fitting
frosted (plexi)glass in front of the LED array, making your own
reflectors, cannibalising an old halogen bulb assy. and substituting
the bulb-part with LEDs.
Alternatively, we've considered simply
replacing the capsule bulb in the regular under-cabinet light
fittings since this includes a reflector.
As for other online ideas try googling
(google.com) with LED lighting / lamps / lights etc. - that
should keep you busy for a while ;-)
Cheers,
Tim H.
I
found this url while browsing for 5
mins,
http://www.theledlight.com/interior.html
the
'moonglow' and 'comet' are the type of thing I'm after (except at
$30 cost too much!)
-----Original
Message-----
From: TAWN
Jonathan
As some of you, like myself
have gone and put our names down for the bulk-buy
LED's...
I'm a little unsure of
mounting these, the purpose of me using these is to go on the edge
of the stairs, to illuminate every other step. The idea of having
some standard bezels is very un-attractive.
What I'm after is some idea's
/ url's / images / thoughts of what could be a suitable, and of
course, aesthetically pleasing devices ! I know some of you have
bought these for use in the garden, so any idea's on those would
be great too (I've ordered 30 in total .. so they need using
!)
Ta,
Jonathan.
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