I am looking to replace a microscope bulb in a piece of equipment with
something somewhat brighter than the "13347W" 6 volt 15 watt BA15 based T6
shaped incandescent that is in at the moment that apparently gives 210
lumens. I bought a cheap torch claiming an output of 2200 lumens from a
"CREE XM-L T6" LED intending to rob the LED module, however I suspect that
the lumens claim is fictitious as it seems no brighter than the bulb.

Does anyone know of an LED module no more than 19 mm in diameter producing
white light of 1000 lumens or more ? (operating voltage / current
unimportant)

Also I'd like to find a data sheet for the "CREE XM-L T6" if anyone knows a
source - the CREE web site isn't helping

Andrew

In article ,
"Andrew Mawson" writes:
I am looking to replace a microscope bulb in a piece of equipment with
something somewhat brighter than the "13347W" 6 volt 15 watt BA15 based T6
shaped incandescent that is in at the moment that apparently gives 210
lumens. I bought a cheap torch claiming an output of 2200 lumens from a
"CREE XM-L T6" LED intending to rob the LED module, however I suspect that
the lumens claim is fictitious as it seems no brighter than the bulb.

Does anyone know of an LED module no more than 19 mm in diameter producing
white light of 1000 lumens or more ? (operating voltage / current
unimportant)

Not possible in that size - couldn't dissipate enough heat and stay
within LED junction's operating temperature. That would be an LED with
an equivalent mains filament lamp output of around 70W.

However, you don't need anything like that light level. A 3W LED will
easily give 210 lumens, but as they can be directional and/or focused,
the light intensity can be an order of magnitude or more higher than
your 15W filament lamp.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

On Thu, 5 Mar 2015 10:38:24 -0000, "Andrew Mawson"
wrote:

I am looking to replace a microscope bulb in a piece of equipment with
something somewhat brighter than the "13347W" 6 volt 15 watt BA15 based T6
shaped incandescent that is in at the moment that apparently gives 210
lumens. I bought a cheap torch claiming an output of 2200 lumens from a
"CREE XM-L T6" LED intending to rob the LED module, however I suspect that
the lumens claim is fictitious as it seems no brighter than the bulb.

Does anyone know of an LED module no more than 19 mm in diameter producing
white light of 1000 lumens or more ? (operating voltage / current
unimportant)

Also I'd like to find a data sheet for the "CREE XM-L T6" if anyone knows a
source - the CREE web site isn't helping



http://www.cree.com/LED-Components-a...nal/XLamp-XML#

The first document details the binning that the manufacturer performs post
manufacture to group the LED's by output which is the T6 section of the part
number.

The second is the datasheet, 900 lumens is about the limit when driving the
device at around 3A, heatsinking could prove 'difficult'

Why the need for all that light when the exisiting installation is just 210
lumens?

http://www.cree.com/~/media/Files/Cr.../XLampXMBL.pdf
http://www.cree.com/~/media/Files/Cr...g/XLampXML.pdf

Safety!

http://www.cree.com/~/media/Files/Cr..._EyeSafety.pdf

P.S. There are lot's of fakes about
--

"The Other Mike" wrote in message
...

On Thu, 5 Mar 2015 10:38:24 -0000, "Andrew Mawson"
wrote:

I am looking to replace a microscope bulb in a piece of equipment with
something somewhat brighter than the "13347W" 6 volt 15 watt BA15 based T6
shaped incandescent that is in at the moment that apparently gives 210
lumens. I bought a cheap torch claiming an output of 2200 lumens from a
"CREE XM-L T6" LED intending to rob the LED module, however I suspect that
the lumens claim is fictitious as it seems no brighter than the bulb.

Does anyone know of an LED module no more than 19 mm in diameter producing
white light of 1000 lumens or more ? (operating voltage / current
unimportant)

Also I'd like to find a data sheet for the "CREE XM-L T6" if anyone knows
a
source - the CREE web site isn't helping



http://www.cree.com/LED-Components-a...nal/XLamp-XML#

The first document details the binning that the manufacturer performs post
manufacture to group the LED's by output which is the T6 section of the
part
number.

The second is the datasheet, 900 lumens is about the limit when driving the
device at around 3A, heatsinking could prove 'difficult'

Why the need for all that light when the exisiting installation is just 210
lumens?

http://www.cree.com/~/media/Files/Cr.../XLampXMBL.pdf
http://www.cree.com/~/media/Files/Cr...g/XLampXML.pdf

Safety!

http://www.cree.com/~/media/Files/Cr..._EyeSafety.pdf

P.S. There are lot's of fakes about
--

Thanks for those links, much appreciated.

The image is projected onto a 3" diameter ground glass screen - the
application is setting tool height on a CNC lathe.

On 05/03/2015 13:50, Andrew Mawson wrote:
"The Other Mike" wrote in message
...

On Thu, 5 Mar 2015 10:38:24 -0000, "Andrew Mawson"
wrote:

I am looking to replace a microscope bulb in a piece of equipment with
something somewhat brighter than the "13347W" 6 volt 15 watt BA15
based T6
shaped incandescent that is in at the moment that apparently gives 210
lumens. I bought a cheap torch claiming an output of 2200 lumens from a
"CREE XM-L T6" LED intending to rob the LED module, however I suspect
that
the lumens claim is fictitious as it seems no brighter than the bulb.

Does anyone know of an LED module no more than 19 mm in diameter
producing
white light of 1000 lumens or more ? (operating voltage / current
unimportant)

Also I'd like to find a data sheet for the "CREE XM-L T6" if anyone
knows a
source - the CREE web site isn't helping


http://www.cree.com/LED-Components-a...nal/XLamp-XML#


The first document details the binning that the manufacturer performs
post
manufacture to group the LED's by output which is the T6 section of
the part
number.

The second is the datasheet, 900 lumens is about the limit when
driving the
device at around 3A, heatsinking could prove 'difficult'

Why the need for all that light when the exisiting installation is
just 210
lumens?

http://www.cree.com/~/media/Files/Cr.../XLampXMBL.pdf

http://www.cree.com/~/media/Files/Cr...g/XLampXML.pdf


Safety!

http://www.cree.com/~/media/Files/Cr..._EyeSafety.pdf


P.S. There are lot's of fakes about
--

Thanks for those links, much appreciated.

The image is projected onto a 3" diameter ground glass screen - the
application is setting tool height on a CNC lathe.

Assuming therefore that you can machine and tap your own aluminium
heatsink why not buy a bare batwing LED array in the 7W category and
mount it yourself so that it fits where the old filament bulb went.

http://www.rapidonline.com/electroni...-650lm-55-2750

You might need a condenser lens or two to make the light parallel if it
is intended for microscopy and you choose a single die device. LEDs
aren't quite point sources but they are not all that far off either.

Getting the relatively small amount of heat away will be important. An
LED doesn't like to be too warm or the junction degrades quickly.

--
Regards,
Martin Brown

In article ,
Martin Brown writes:
Assuming therefore that you can machine and tap your own aluminium
heatsink why not buy a bare batwing LED array in the 7W category and
mount it yourself so that it fits where the old filament bulb went.

http://www.rapidonline.com/electroni...-650lm-55-2750

I've used some of those. Seriously bright, so be careful during the
assembly/testing (run from much lower current to avoid full output
in your eyes).

BTW, it's a lambertian light distribution (which is what you want
here), not batwing. (I don't think you can buy any batwing distribution
LEDs anymore - they all vanished just as I wanted to buy some;-)

You might need a condenser lens or two to make the light parallel if it
is intended for microscopy and you choose a single die device. LEDs
aren't quite point sources but they are not all that far off either.

Getting the relatively small amount of heat away will be important. An
LED doesn't like to be too warm or the junction degrades quickly.

Also, this module is not very temperature-stable - it really does
need a constant current supply, and not a simple series resistor.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

On Thursday, March 5, 2015 at 10:38:18 AM UTC, Andrew Mawson wrote:
I am looking to replace a microscope bulb in a piece of equipment with
something somewhat brighter than the "13347W" 6 volt 15 watt BA15 based T6
shaped incandescent that is in at the moment that apparently gives 210
lumens. I bought a cheap torch claiming an output of 2200 lumens from a
"CREE XM-L T6" LED intending to rob the LED module, however I suspect that
the lumens claim is fictitious as it seems no brighter than the bulb.

Does anyone know of an LED module no more than 19 mm in diameter producing
white light of 1000 lumens or more ? (operating voltage / current
unimportant)

Also I'd like to find a data sheet for the "CREE XM-L T6" if anyone knows a
source - the CREE web site isn't helping

Andrew

LED macro ring?

"Adam Aglionby" wrote in message
...

On Thursday, March 5, 2015 at 10:38:18 AM UTC, Andrew Mawson wrote:
I am looking to replace a microscope bulb in a piece of equipment with
something somewhat brighter than the "13347W" 6 volt 15 watt BA15 based
T6
shaped incandescent that is in at the moment that apparently gives 210
lumens. I bought a cheap torch claiming an output of 2200 lumens from a
"CREE XM-L T6" LED intending to rob the LED module, however I suspect
that
the lumens claim is fictitious as it seems no brighter than the bulb.

Does anyone know of an LED module no more than 19 mm in diameter
producing
white light of 1000 lumens or more ? (operating voltage / current
unimportant)

Also I'd like to find a data sheet for the "CREE XM-L T6" if anyone knows
a
source - the CREE web site isn't helping

Andrew

LED macro ring?

Nice bit of lateral thinking - I'll experiment

Andrew

In article ,
Andrew Mawson wrote:
Does anyone know of an LED module no more than 19 mm in diameter
producing white light of 1000 lumens or more ? (operating voltage /
current unimportant)

You'd need to define 'white light'. Problem with LEDs is producing a
reasonably consistent spectrum. Which comes for free with tungsten.

Of course this may not matter for your application.

--
*Isn't it a bit unnerving that doctors call what they do "practice?"

Dave Plowman London SW
To e-mail, change noise into sound.

On 05/03/2015 10:38, Andrew Mawson wrote:
I am looking to replace a microscope bulb in a piece of equipment with
something somewhat brighter than the "13347W" 6 volt 15 watt BA15 based
T6 shaped incandescent that is in at the moment that apparently gives
210 lumens. I bought a cheap torch claiming an output of 2200 lumens
from a "CREE XM-L T6" LED intending to rob the LED module, however I
suspect that the lumens claim is fictitious as it seems no brighter than
the bulb.

Does anyone know of an LED module no more than 19 mm in diameter
producing white light of 1000 lumens or more ? (operating voltage /
current unimportant)

Also I'd like to find a data sheet for the "CREE XM-L T6" if anyone
knows a source - the CREE web site isn't helping

Andrew

LEDs come with different beam angles and may require different lenses in
front of them. A LED in a touch may be optimised for a wide beam angle
and the cover glass on the torch is likely to be focussing the light.
You may require a LED with a narrow beam.
Try looking at the power led section of the
www.led.de site (there is a switch for English web pages) and/or the
optional optics for the LEDs. You may/will require some heat sinking.
Excessive heat will result in a short life span.

--
mailto: news {at} admac {dot] myzen {dot} co {dot} uk