Halogen Bulbs mr16

[aolson@phoeintl.com]

I don't know much about these things but have been lookin for some
cheaper bulbs on ebay and other online stores. I see there are some
with 24 degrees, 36 degrees, etc some with and without covers. What
does that mean and what should i be looking at getting? Is there
anything I should or should not look for when buying these things?
These will be used more for accent lighting in a track.
Thanks for the help in advance

[Jeff Volp]

The angle is how much the light disperses. A low angle will give you more
intense spot illumination while a higher angle will have the light spread
out for more even coverage. Auction 4418657689 includes a good diagram of
how much the light spreads.

A cover or lens would keep dust from getting into the reflector in dusty
location, and make it easy to clean.

I wonder if anyone has experience with the LED versions? I have been
considering them as an incandescent replacement for dimmable lights that are
on 24/7.

Jeff

<aolson@phoeintl.com> wrote in message
news:1132445678.008161.236440@g14g2000cwa.googlegr oups.com...
> I don't know much about these things but have been lookin for some
> cheaper bulbs on ebay and other online stores. I see there are some
> with 24 degrees, 36 degrees, etc some with and without covers. What
> does that mean and what should i be looking at getting? Is there
> anything I should or should not look for when buying these things?
> These will be used more for accent lighting in a track.
> Thanks for the help in advance
>

[Marc F Hult]

On Sun, 20 Nov 2005 14:53:08 GMT, "Jeff Volp" <JeffVolp@msn.com> wrote in
message <o50gf.135184$zb5.33411@bgtnsc04-news.ops.worldnet.att.net>:

>
>A cover or lens would keep dust from getting into the reflector in dusty
>location, and make it easy to clean.

Well that too;-) But ore importantly, UL now _requires_ that the 'quartz'
envelope containing the filament be covered with protective, UV-absorbing
glass in order for open-lamp luminaries to receive UL listing.

http://www.pge.com/003_save_energy/003c_edu_train/pec/info_resource/pdf/Low_Voltage_Tungsten_Halogen_Lamps.pdf

Too many fires from those infamous torchieres.

http://sb.thehartford.com/reduce_risk/loss_library/Fire_Safety/Halogen_Torchiere_Lamps.pdf

HTH ... Marc
Marc_F_Hult
www.ECOntrol.org

[Jeff Volp]

"Marc F Hult" <MFHult@nothydrologistnot.com> wrote in message
news:m9t1o1lkn8pn2951s73g3ovsp6grl2omiu@4ax.com...
> On Sun, 20 Nov 2005 14:53:08 GMT, "Jeff Volp" <JeffVolp@msn.com> wrote in
> message <o50gf.135184$zb5.33411@bgtnsc04-news.ops.worldnet.att.net>:
>
> >
> >A cover or lens would keep dust from getting into the reflector in dusty
> >location, and make it easy to clean.
>
> Well that too;-) But ore importantly, UL now _requires_ that the 'quartz'
> envelope containing the filament be covered with protective, UV-absorbing
> glass in order for open-lamp luminaries to receive UL listing.

Good info Marc,

But I thought the fire hazard was from those big multi-hundred watt quartz
floor lamps where drapes could fall on the hot bulb. I remember the problem
several ago, and the related recalls and retrofits. I didn't think it was
an issue for the 20 to 75 watt ceiling spot fixtures. There were already UL
regulations in place to keep combustables away from such fixtures.

Jeff

[Marc F Hult]

On Wed, 23 Nov 2005 16:05:08 GMT, "Jeff Volp" <JeffVolp@msn.com> wrote in
message <Uq0hf.154436$zb5.99213@bgtnsc04-news.ops.worldnet.att.net>:

>"Marc F Hult" <MFHult@nothydrologistnot.com> wrote in message
>news:m9t1o1lkn8pn2951s73g3ovsp6grl2omiu@4ax.com...
>> On Sun, 20 Nov 2005 14:53:08 GMT, "Jeff Volp" <JeffVolp@msn.com> wrote in
>> message <o50gf.135184$zb5.33411@bgtnsc04-news.ops.worldnet.att.net>:
>>
>> >
>> >A cover or lens would keep dust from getting into the reflector in dusty
>> >location, and make it easy to clean.
>>
>> Well that too;-) But ore importantly, UL now _requires_ that the 'quartz'
>> envelope containing the filament be covered with protective, UV-absorbing
>> glass in order for open-lamp luminaries to receive UL listing.
>
>Good info Marc,
>
>But I thought the fire hazard was from those big multi-hundred watt quartz
>floor lamps where drapes could fall on the hot bulb. I remember the problem
>several ago, and the related recalls and retrofits. I didn't think it was
>an issue for the 20 to 75 watt ceiling spot fixtures. There were already UL
>regulations in place to keep combustables away from such fixtures.
>
>Jeff
>

Right. 500 watt lamps previously used in torchieres no longer meet UL/US code.
The max allowed in now 300 watts.

An important mechanism in halogen lamps is the maintenance of the
envelope/capsule at a high temperature in order to reduce condensation of
tungsten on the walls and allow regeneneration of the filament through what is
dubbed the "halogen cycle". So the capsule of even small halogen lamps may be
very hot by design. Also the cover glass protects against glass shards should
the capsule shatter.

Marc
Marc_F_Hult
www.ECOntrol.org