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CFL in out door luminaries

J

jriegle

Jan 1, 1970
0
At the office we have comercial grade path luminaries with louvers that keep
the light on the ground similar to the 12 volt systems, but these are 120
volt with the medium screw base for A type lamps. A glass envelope somewhat
resembling an inverted jar screws down over the bulb. I'm wondering if heat
buildup would be a problem with 14 watt mini spiral CFLs. The base position
is down. I wouldn't consider base up or base horizontal in this condition,
but I think base down is do-able. What do you think?
John
 
V

Victor Roberts

Jan 1, 1970
0
At the office we have comercial grade path luminaries with louvers that keep
the light on the ground similar to the 12 volt systems, but these are 120
volt with the medium screw base for A type lamps. A glass envelope somewhat
resembling an inverted jar screws down over the bulb. I'm wondering if heat
buildup would be a problem with 14 watt mini spiral CFLs. The base position
is down. I wouldn't consider base up or base horizontal in this condition,
but I think base down is do-able. What do you think?
John

With a screw-on glass cover that restricts air flow, there may not be
much difference between base-up and base-down ballast temperatures. I
would get some of the stick-on temperature tags used in the
electronics industry, apply them to the outside of the ballast
compartment and see what temperature is produced. If you live where it
gets hot, and the lamps are ever on in the day time in the summer, you
may not be able to get an accurate picture of the temperature problem
at this time of year.
 
L

Loren Coe

Jan 1, 1970
0
i blew one in a similar indoor fixture, but with the glass envelope open
at the top, and closed about the base of the bulb/ballast. it lasted less
than one week and blew a hole thru the ballast. removed the glass, and it
has lasted about 18mos, so far. --Loren
 
D

David

Jan 1, 1970
0
Dear all :

We deleop this type which can use in 12V system, the lamp holder is G4 (
same as MR-16), if interesting in it, please ask me at [email protected]

David Huang

 
J

JM

Jan 1, 1970
0
quoting:
i blew one in a similar indoor fixture, but with the glass envelope open
at the top, and closed about the base of the bulb/ballast. it lasted less
than one week and blew a hole thru the ballast. removed the glass, and it
has lasted about 18mos, so far. --Loren


How about those CFLs that are shaped like an A lamp. They must be able to
tolerate extra heat because the lamp itself is already fully enclosed.
Otherwise, they would have an extremely high early failure rate.
 
D

Daniel Stern Lighting

Jan 1, 1970
0
Oh, joy. Look what the cat dragged in: A chunk of Spam!



Dear all :

We deleop this type which can use in 12V system, the lamp holder is G4 (
same as MR-16), if interesting in it, please ask me at [email protected]

David Huang
 
D

Don Klipstein

Jan 1, 1970
0
How about those CFLs that are shaped like an A lamp. They must be able
to tolerate extra heat because the lamp itself is already fully enclosed.
Otherwise, they would have an extremely high early failure rate.

In CFLs with bulbs that enclose the tubing, the outer bulb does not
enclose the ballast. If you put an additional enclosure around such a
lamp, the tubing may have mercury vapor pressure not too badly excessive,
but the ballast gets hotter just as badly, or at least almost as badly, as
if you enclose a CFL that does not have an outer bulb.

In small enclosures, I would recommend CFLs of lower wattage or intended
to work where heat builds up - such as ones rated for use in recessed
ceiling fixtures. 15 and 20 watt Philips "SLS" ones are rated for use in
recessed ceiling fixtures, it appears to me that 23-plus watt Philips SLS
ones are not, and that most other CFLs are not. I do see 9 and 13 watt PL
lamps with screw-in magnetic ballast-adapters, especially 9-watt, usually
get away with use in recessed ceiling fixtures. In base-down operation,
the 13 watt PL types appear truly reliable to me in small enclosed
fixtures.

Another possibility: The GE "post lamp" CFLs, which appear intended for
use in smallish enclosed fixtures - outdoors yet!

- Don Klipstein ([email protected])
 
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