On Tue, 13 Aug 2013 15:32:49 +0100, "Arfa Daily"
wrote:

Not at all. Readily available from multiple sources. As with everything, you
gets what you pays for, but prices start from a couple of hundred quid up

http://compare.ebay.co.uk/like/17099...14=6 5&ff19=0

You have to watch out for low resolutions with the cheap and cheerful
ones. The claimed 720p and 1080p is often complete mince, with a
native panel inside of 800x600.
My own small one is only that, and while it will be getting fitted
with a 20 or 30W (or greater) LED assembly over winter, I'm only using
it as a test bed for something better later on.
I had already built an overhead variant, using a stripped monitor
panel and that gave me 720p, which was worthwhile for a couple of
years, but it's a big, clunky thing and not portable.
Small, neat and cool, is the thing. And ceiling mountable.

"Grimly Curmudgeon" wrote in message
...
On Tue, 13 Aug 2013 15:32:49 +0100, "Arfa Daily"
wrote:

Not at all. Readily available from multiple sources. As with everything,
you
gets what you pays for, but prices start from a couple of hundred quid up

http://compare.ebay.co.uk/like/17099...14=6 5&ff19=0

You have to watch out for low resolutions with the cheap and cheerful
ones. The claimed 720p and 1080p is often complete mince, with a
native panel inside of 800x600.
My own small one is only that, and while it will be getting fitted
with a 20 or 30W (or greater) LED assembly over winter, I'm only using
it as a test bed for something better later on.
I had already built an overhead variant, using a stripped monitor
panel and that gave me 720p, which was worthwhile for a couple of
years, but it's a big, clunky thing and not portable.
Small, neat and cool, is the thing. And ceiling mountable.


All agreed. But hi res ones are among them for sensible prices. Have you
picked your LED and lenses for your re-lamping project yet ? Myself and a
colleague are just at an early stage of doing some work on a new lighting
effect. There are now some very powerful white and RGB LEDs coming out of
China at very good prices. Also, the optics seem to be similarly available.
I have a pair of collimating lenses on order at the moment. Optical grade
glass, and less than a fiver, shipped !

Arfa

Grimly Curmudgeon writes:

On Tue, 13 Aug 2013 15:32:49 +0100, "Arfa Daily"
wrote:

Not at all. Readily available from multiple sources. As with everything, you
gets what you pays for, but prices start from a couple of hundred quid up

http://compare.ebay.co.uk/like/17099...14=6 5&ff19=0

You have to watch out for low resolutions with the cheap and cheerful
ones. The claimed 720p and 1080p is often complete mince, with a
native panel inside of 800x600.
My own small one is only that, and while it will be getting fitted
with a 20 or 30W (or greater) LED assembly over winter, I'm only using
it as a test bed for something better later on.

Should I read that to mean that it's possible, at least in principle,
to fit an LED cluster in place of a bulb?

I had already built an overhead variant, using a stripped monitor
panel and that gave me 720p, which was worthwhile for a couple of
years, but it's a big, clunky thing and not portable.
Small, neat and cool, is the thing. And ceiling mountable.

--
Windmill, Use t m i l l
J.R.R. Tolkien:- @ S c o t s h o m e . c o m
All that is gold does not glister / Not all who wander are lost

"Windmill" wrote in message
...
Grimly Curmudgeon writes:

On Tue, 13 Aug 2013 15:32:49 +0100, "Arfa Daily"
wrote:

Not at all. Readily available from multiple sources. As with everything,
you
gets what you pays for, but prices start from a couple of hundred quid up

http://compare.ebay.co.uk/like/17099...14=6 5&ff19=0

You have to watch out for low resolutions with the cheap and cheerful
ones. The claimed 720p and 1080p is often complete mince, with a
native panel inside of 800x600.
My own small one is only that, and while it will be getting fitted
with a 20 or 30W (or greater) LED assembly over winter, I'm only using
it as a test bed for something better later on.

Should I read that to mean that it's possible, at least in principle,
to fit an LED cluster in place of a bulb?

In principle, yes, although the optics may require a degree of modification.
For a start, a power LED collimating reflector will need to be fitted. Any
existing reflector is unlikely to be suitable. Once you have a basically
collimated beam, the following optics may or may not be suitable. I am
currently working on a project with a colleague to assess the feasibility of
replacing conventional lamps in some entertainment lighting fixtures, with
high power LEDs. I have some bits and pieces of optics on order from China,
right now.

Arfa



I had already built an overhead variant, using a stripped monitor
panel and that gave me 720p, which was worthwhile for a couple of
years, but it's a big, clunky thing and not portable.
Small, neat and cool, is the thing. And ceiling mountable.

--
Windmill, Use t m i l l
J.R.R. Tolkien:- @ S c o t s h o m e . c o m
All that is gold does not glister / Not all who wander are lost

On Fri, 16 Aug 2013 10:36:54 +0100, "Arfa Daily"
wrote:

All agreed. But hi res ones are among them for sensible prices. Have you
picked your LED and lenses for your re-lamping project yet ? Myself and a
colleague are just at an early stage of doing some work on a new lighting
effect. There are now some very powerful white and RGB LEDs coming out of
China at very good prices. Also, the optics seem to be similarly available.
I have a pair of collimating lenses on order at the moment. Optical grade
glass, and less than a fiver, shipped !

Every time I look the previously just-out-of-feasible LED price has
dropped another notch or two, so by the time I get around to it, it
will probably be 50W (although, forced cooling of that will be
problematic). I might just stick to 30W, as it's dead cheap now, the
optics are cheap and easy and cooling isn't so much of an issue. Not
much point spending too much dosh on a test set-up and it failing
because of cramped space.
It's an old Mitsubishi LVP SA51U, which I've stripped the lamp driver
board out of and already used a 150W HID lamp in an external light
tunnel for - that worked, but was too dim. Picture quality was ok,
though.

On Sun, 18 Aug 2013 02:45:46 GMT, lid
(Windmill) wrote:

Should I read that to mean that it's possible, at least in principle,
to fit an LED cluster in place of a bulb?

Oh, for sure; plenty have already done it.
There's a French projector site dealing with various mods - normal HID
and LED re-lamping of projectors.
http://www.allinbox.com/modding.htm

Grimly Curmudgeon writes:

On Sun, 18 Aug 2013 02:45:46 GMT, lid
(Windmill) wrote:

Should I read that to mean that it's possible, at least in principle,
to fit an LED cluster in place of a bulb?

Oh, for sure; plenty have already done it.
There's a French projector site dealing with various mods - normal HID
and LED re-lamping of projectors.
http://www.allinbox.com/modding.htm

Mais je ne parle pas Francais!

(Though I once managed to order from Germany with the help of Google
Translate)

--
Windmill, Use t m i l l
J.R.R. Tolkien:- @ S c o t s h o m e . c o m
All that is gold does not glister / Not all who wander are lost

On 18/08/2013 13:49, Grimly Curmudgeon wrote:
On Fri, 16 Aug 2013 10:36:54 +0100, "Arfa Daily"
wrote:

All agreed. But hi res ones are among them for sensible prices. Have you
picked your LED and lenses for your re-lamping project yet ? Myself and a
colleague are just at an early stage of doing some work on a new lighting
effect. There are now some very powerful white and RGB LEDs coming out of
China at very good prices. Also, the optics seem to be similarly available.
I have a pair of collimating lenses on order at the moment. Optical grade
glass, and less than a fiver, shipped !

Every time I look the previously just-out-of-feasible LED price has
dropped another notch or two, so by the time I get around to it, it
will probably be 50W (although, forced cooling of that will be
problematic).

How about a Liquid cooling kit as used in PCs?

--
Adrian C

On Mon, 19 Aug 2013 11:17:25 +0100, Adrian C
wrote:

How about a Liquid cooling kit as used in PCs?

Certainly feasible and the price of those has dropped a lot.

On Mon, 19 Aug 2013 01:50:22 GMT, lid
(Windmill) wrote:

http://www.allinbox.com/modding.htm

Mais je ne parle pas Francais!

Paste the page url into google translate and it does it.

On Sat, 31 Aug 2013 01:05:59 +0100, "Arfa Daily"
wrote:

My collimating reflector and lens arrived yesterday, so I stuck it on the
front of the 10 watt led, and it does a seriously good job of collecting the
light being emitted from all the individual leds on the die, and flinging it
forwards. When you then add the lens, it becomes a pretty decent light
source. It put a good daylight-visible circle of light 4 ft in diameter on
the ceiling ... :-)

Only just saw this post.
Rule of thumb - by the time the light gets through the guts of the
projector and onto the screen it's about 1/10th of what you start
with.

"Grimly Curmudgeon" wrote in message
...
On Sat, 31 Aug 2013 01:05:59 +0100, "Arfa Daily"
wrote:

My collimating reflector and lens arrived yesterday, so I stuck it on the
front of the 10 watt led, and it does a seriously good job of collecting
the
light being emitted from all the individual leds on the die, and flinging
it
forwards. When you then add the lens, it becomes a pretty decent light
source. It put a good daylight-visible circle of light 4 ft in diameter on
the ceiling ... :-)

Only just saw this post.
Rule of thumb - by the time the light gets through the guts of the
projector and onto the screen it's about 1/10th of what you start
with.

Probably true. The point I was making here though, is how good a job the
collimating reflector does of collecting all of the light up. The result was
at least twice the forward brightness, as with the lens alone (perceived
rather than actually measured)

Arfa