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Bizarre Sylvania lamp

Discussion in 'Lighting' started by Daniel J. Stern, Feb 12, 2004.

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  1. 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

    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.

  2. 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
  3. TKM

    TKM Guest

    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
  4. ?? Not sure I understand the significance of "true" here. Are not most
    120V halogen lamps...true 120V halogen lamps?
    Not shabby!
    Interesting. I spot only the clear versions, and only in 75W and 100W, on
    local shelves.
    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...??

  5. Not much, Terry! ;>)}

    Jeff Waymouth
  6. TKM

    TKM Guest

    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
  7. AC/DCdude17

    AC/DCdude17 Guest

    X-No-Archive: Yes

    So, basically it's an Osram Sylvania version of Philips' Halogena type lamp.
  8. 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
  9. AC/DCdude17

    AC/DCdude17 Guest

    X-No-Archive: Yes

    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.
  10. 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
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