Can anyone tell me the difference between GU10 and GZ10 Mains Halogen
bulbs . The GU10 are described as aluminium . Is it to do with the
reflector ??
Stuart

In article ,
Stuart writes:
Can anyone tell me the difference between GU10 and GZ10 Mains Halogen
bulbs . The GU10 are described as aluminium . Is it to do with the
reflector ??

Yes.
GZ10 are dichroic lamps which dump a lot of heat back into the fitting.
GU10 are aluminium reflector lamps which direct more of the heat out
with the light beam.

You can use GU10 lamps in GZ10 fittings, but not the other way round.
The lamp bases are slightly different and should prevent GZ10 lamps
being used in fittings not designed to handle the extra heat being
dumped backwards.

--
Andrew Gabriel

"Andrew Gabriel" wrote in message
...
In article ,
Stuart writes:
Can anyone tell me the difference between GU10 and GZ10 Mains Halogen
bulbs . The GU10 are described as aluminium . Is it to do with the
reflector ??

Yes.
GZ10 are dichroic lamps which dump a lot of heat back into the fitting.
GU10 are aluminium reflector lamps which direct more of the heat out
with the light beam.

Even more helpfully, Sainsbury's label them both as dichroic on their
price labels!

Cheapest GU10s I've found is Wickes 5 for £15. Anyone seen cheaper?
Al

On Wed, 24 Dec 2003 06:53:18 -0000, "Al Reynolds"
wrote:

"Andrew Gabriel" wrote in message
...
In article ,
Stuart writes:
Can anyone tell me the difference between GU10 and GZ10 Mains Halogen
bulbs . The GU10 are described as aluminium . Is it to do with the
reflector ??

Yes.
GZ10 are dichroic lamps which dump a lot of heat back into the fitting.
GU10 are aluminium reflector lamps which direct more of the heat out
with the light beam.

Even more helpfully, Sainsbury's label them both as dichroic on their
price labels!

Cheapest GU10s I've found is Wickes 5 for £15. Anyone seen cheaper?
Al


Screwfix do these
http://www.screwfix.com/app/sfd/cat/...64409&id=19699
plus postage of course .
Stuart

"Al Reynolds" wrote in message
...
"Andrew Gabriel" wrote in message
...
In article ,
Stuart writes:
Can anyone tell me the difference between GU10 and GZ10 Mains Halogen
bulbs . The GU10 are described as aluminium . Is it to do with the
reflector ??

Yes.
GZ10 are dichroic lamps which dump a lot of heat back into the fitting.
GU10 are aluminium reflector lamps which direct more of the heat out
with the light beam.

Even more helpfully, Sainsbury's label them both as dichroic on their
price labels!

Cheapest GU10s I've found is Wickes 5 for £15. Anyone seen cheaper?
Al



Check the nominal lifetime of the bulbs ... the cheapies are generally only
rated at 1000hrs, whereas the slightly more expensive ones are 2000 hrs. BTW
the screwfix more expensive GU10's are made by Osram and are rated at 2000
hrs.

You pays yer money, yer takes yer choice!

In article ,
"Dave Gibson" writes:

"Al Reynolds" wrote in message
...
Check the nominal lifetime of the bulbs ... the cheapies are generally only
rated at 1000hrs, whereas the slightly more expensive ones are 2000 hrs. BTW
the screwfix more expensive GU10's are made by Osram and are rated at 2000
hrs.

You pays yer money, yer takes yer choice!

Also bear in mind that the main cost is that of the electricity
used, not the bulb. Using a shorter life bulb may give you higher
light output and enable use of fewer or lower wattage lamps, which
will make a much more significant cost reduction than the difference
in bulb prices.

--
Andrew Gabriel

"Andrew Gabriel" wrote in message
...
In article ,
"Dave Gibson" writes:

"Al Reynolds" wrote in message
...
Check the nominal lifetime of the bulbs ... the cheapies are generally
only
rated at 1000hrs, whereas the slightly more expensive ones are 2000 hrs.
BTW
the screwfix more expensive GU10's are made by Osram and are rated at
2000
hrs.

You pays yer money, yer takes yer choice!

Also bear in mind that the main cost is that of the electricity
used, not the bulb. Using a shorter life bulb may give you higher
light output and enable use of fewer or lower wattage lamps, which
will make a much more significant cost reduction than the difference
in bulb prices.

--
Andrew Gabriel

WTF?
50W is 50W in my book!

1000hrs at 50W costs about £3.00 at 6p per kWh.
2000hrs at 50W costs about £6.00.

Also the GU10's that come *complete* with the fitting I reckon have an
average life of 200hrs or less.

Dave