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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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