Bizarre Sylvania lamp

[Daniel J. Stern]

I've been eyeing an odd Sylvania halogen lamp for a year or so in the
local Rona ("Home Depot" in Canadian), and finally bought a couple. Its
designation is 75T10/HAL , and the box describes it as "Tungsten Halogen
T10 120V Clear". It's cylindrical, about 1.25" diameter (which makes sense
given the T10 designation), nickelplate E26 (US Medium screw) base. The
outer glass tube is *very* thick and sturdy, and houses a
smaller-diameter, equally sturdy-looking quartz or hardglass lamp envelope
in which a four-segmented axial filament burns. There is a hefty white
ceramic disc between the top of the base cup and the bottom of the outer
tube.

I can find no information on this odd lamp. What is its intended
application? What is its luminous flux? Rated hours?

It's a very spendy lamp; cost me about CAD$21 retail.

DS

 

[Jeff Waymouth]

Dan,

It is a true 120V halogen lamp. It's rated life is 2000 hours and
produces 1100 lumens. It is available both clear and frosted and 100,
150 and 250 watt version are also available. The outer envelope is
"sturdy" as a customer safety feature. Since most halogen capsules
operate at high internal pressures, violent faillure at end of life is a
possibilityl. The thick outer jacket will contain any such violent
failure. Since it is small, relatively, however, it DOES get hot.
DOn't unscrew it after use untill th elamp has had sufficient time to
cool down.

Jeff Waymouth

 

[TKM]

Dan,

It is a true 120V halogen lamp. It's rated life is 2000 hours and
produces 1100 lumens. It is available both clear and frosted and 100,
150 and 250 watt version are also available. The outer envelope is
"sturdy" as a customer safety feature. Since most halogen capsules
operate at high internal pressures, violent faillure at end of life is a
possibilityl. The thick outer jacket will contain any such violent
failure. Since it is small, relatively, however, it DOES get hot.
DOn't unscrew it after use untill th elamp has had sufficient time to
cool down.

Jeff Waymouth

So, it's a 75 watt, small, full-featured tungsten halogen lamp designed to
be installed in conventional sockets in commercial or consumer applications.
It has double the life of conventional lamps, halogen color and, I assume, a
bit more efficacy. That doesn't sound like enough to make up for the price
for home use; but maybe in some commercial applications where the cost to
replace lamps is high (chandeliers in high-ceiling areas, say) it might make
sense. What have I missed?

Terry McGowan

 

[Daniel J. Stern]

It is a true 120V halogen lamp.

?? Not sure I understand the significance of "true" here. Are not most
120V halogen lamps...true 120V halogen lamps?

It's rated life is 2000 hours and produces 1100 lumens.

Not shabby!

It is available both clear and frosted and 100, 150 and 250 watt version
are also available.

Interesting. I spot only the clear versions, and only in 75W and 100W, on
local shelves.

The outer envelope is "sturdy" as a customer safety feature.

OK, so in that regard it's similar to Capsylite, but Capsylite has lower
efficacy and costs less. Also, what's with the bizarre T10 form factor??

What's the intended market for this lamp? Industrial applications, or...??

DS

 

[Jeff Waymouth]

Not much, Terry! ;>)}

Jeff Waymouth

So, it's a 75 watt, small, full-featured tungsten halogen lamp designed to
be installed in conventional sockets in commercial or consumer applications.
It has double the life of conventional lamps, halogen color and, I assume, a
bit more efficacy. That doesn't sound like enough to make up for the price
for home use; but maybe in some commercial applications where the cost to
replace lamps is high (chandeliers in high-ceiling areas, say) it might make
sense. What have I missed?

Terry McGowan

 

[TKM]

?? Not sure I understand the significance of "true" here. Are not most
120V halogen lamps...true 120V halogen lamps?


OK, so in that regard it's similar to Capsylite, but Capsylite has lower
efficacy and costs less. Also, what's with the bizarre T10 form factor??

What's the intended market for this lamp? Industrial applications, or...??

DS

Sorry, I should have been clear. "True" halogen was intended to mean a
halogen lamp that operates such that tungsten filament recycling takes place
via a halogen cycle so overall performance (life, light output, light output
over time, efficacy and color) are optimized for the design. Some halogen
lamps -- typically those with glass envelopes -- aren't designed with enough
pressure for the halogen cycle to operate. They're little more than
conventional incandescent lamps.

Since the Sylvania lamp has a thick glass outer envelope to trap the broken
pieces in case of filament tube rupture, that indicates a pressurized
filament tube and the data indicate an operating halogen cycle. GE has some
similar lamps (the 50 and 90TBH) with a much less sexy outer bulb known
affectionatelyy as the "coke bottle" lamp.

Terry McGowan

 

[AC/DCdude17]

X-No-Archive: Yes

So, basically it's an Osram Sylvania version of Philips' Halogena type lamp.

 

[Daniel J. Stern]

So, basically it's an Osram Sylvania version of Philips' Halogena type lamp.

Quite not. Halogena is aimed at extended life with flux roughly equal to
an A-line lamp of the same wattage; the Sylvania T10 lamp provides greater
intensity.

 

[AC/DCdude17]

X-No-Archive: Yes

Quite not. Halogena is aimed at extended life with flux roughly equal to
an A-line lamp of the same wattage; the Sylvania T10 lamp provides greater
intensity.

Why do you say that?

Jeff Waymouth quoted these specs for the lamp you mentioned:

"It is a true 120V halogen lamp. It's rated life is 2000 hours and
produces 1100 lumens. "

Let's look at Philips 75W, frosted Halogená.
120V, 1120 lumens output and 3000 hours rated life.

Halogená have the same construction. A small tubular halogen capsule in a
secondary sturdy glass envelope. The only difference is Halogená outer envelope
is a BT-15 designation which looks like a miniature version of some mercury vapor
lamps(narrow on top and bottom, fat in the middle)


Actually, plaind old A-19 75W w/ 750hr life provides greater flux than either of
the above.
Philips 37472-8 ordinary A-19 75W frosted lamp is rated at 1220 lumens.

 

[Jeff Waymouth]

Actually, no. It's been in the catalog for many years (before OSRAM
purchased Sylvania they had it in the OSRAM catalog). I beleive it
predates the halogena.

Jeff Waymouth