1.5 amps vs. 3 amps DJL vs. DJA

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  • apetay
    Member
    • Dec 2013
    • 24
    • USA

    #1

    1.5 amps vs. 3 amps DJL vs. DJA

    sorry I'm a nooby, and I can't seem to find a straight answer. If I have a bulb socket that is rated 120v 150W 3amps, and there's another bulb with the same form factor, only difference is it's rated at 1.5 amps, can I use it as a replacement?

    The bulb place says it's a "possible" match, and I don't mind if it is more dim, I just don't want to fry my projector. If I blow the bulb, at least I tried. It's an old Anscovision 88, but the mechanical is still good.

    Swap in DJL for DJA
    Last edited by apetay; 01-04-2014, 05:09 PM.
    3 repairs under my belt, 3 repairs in progress
  • redwire
    Badcaps Legend
    • Dec 2010
    • 3906
    • Canada

    #2
    Re: 1.5 amps vs. 3 amps DJL vs. DJA

    The two lamps have different focal distances, a 1/2" difference to the filmgate, so the substitute lamp would give less light. I don't know the Ancovision 88 specs. Maybe a DFG?
    DJA datasheet DJL datasheet Source: Don's Bulbs

    The lamp socket rating is limited by two things- its heat rating for the socket and current rating for the connecting pins. Do you mean substitute a 3A (360W@120V) socket for a 1.5A socket (180W@120v)? That's okay.
    Socket ratings depend on if the socket is ceramic or bakelight, and if there is a cooling fan, inrush current blah blah.

    Don't upsize (double) the lamp wattage.... things will melt...

    Comment

    • apetay
      Member
      • Dec 2013
      • 24
      • USA

      #3
      Re: 1.5 amps vs. 3 amps DJL vs. DJA

      Thanks redwire! This was the kinda answer I was looking for. DJA is the one rated for 3 amps that I know my projector can use, however I found some DJL's rated at 1.5 amps, for a very good price. Most of the "info" I saw said that the two had the same W and V ratings, and it was only the amps that were different. I think this is just typical internet disinformation, or I just wasn't paying close enough attention. What's this "inrush current" you speak of? The Ansco 88 does have a cooling fan, btw, and the badge clearly states DFP is a usable bulb as well as DJA.
      3 repairs under my belt, 3 repairs in progress

      Comment

      • LLLlllou
        Badcaps Veteran
        • May 2011
        • 201
        • USA

        #4
        Re: 1.5 amps vs. 3 amps DJL vs. DJA

        Originally posted by apetay
        Thanks redwire! This was the kinda answer I was looking for. DJA is the one rated for 3 amps that I know my projector can use, however I found some DJL's rated at 1.5 amps, for a very good price. Most of the "info" I saw said that the two had the same W and V ratings, and it was only the amps that were different. I think this is just typical internet disinformation, or I just wasn't paying close enough attention. What's this "inrush current" you speak of? The Ansco 88 does have a cooling fan, btw, and the badge clearly states DFP is a usable bulb as well as DJA.
        Not "disinformation", but a flat out lie that defies the laws of physics.

        Wattage "W" is calculated by Voltage "V" times Current "A"

        120V x 3.0A = 360 Watts
        120V x 1.5A = 180 Watts

        Filament light bulbs have a much lower resistance when cold then they do when they are hot, so they pull allot more current at turn on then they do after they reach their normal operating temp. The current pulled by a cold bulb is the "inrush current". it only lasts a few milliseconds, but can be many times the normal current.

        Comment

        • apetay
          Member
          • Dec 2013
          • 24
          • USA

          #5
          Re: 1.5 amps vs. 3 amps DJL vs. DJA

          Originally posted by LLLlllou
          Not "disinformation", but a flat out lie that defies the laws of physics.

          Wattage "W" is calculated by Voltage "V" times Current "A"

          120V x 3.0A = 360 Watts
          120V x 1.5A = 180 Watts

          Filament light bulbs have a much lower resistance when cold then they do when they are hot, so they pull allot more current at turn on then they do after they reach their normal operating temp. The current pulled by a cold bulb is the "inrush current". it only lasts a few milliseconds, but can be many times the normal current.
          More real answers. Geez I love this forum!!!!
          3 repairs under my belt, 3 repairs in progress

          Comment

          • mockingbird
            Badcaps Legend
            • Dec 2008
            • 5484
            • -

            #6
            Re: 1.5 amps vs. 3 amps DJL vs. DJA

            Is this by any chance for a Super 8 projector??? Are you digitizing reels?

            Comment

            • LLLlllou
              Badcaps Veteran
              • May 2011
              • 201
              • USA

              #7
              Re: 1.5 amps vs. 3 amps DJL vs. DJA

              Originally posted by apetay
              More real answers. Geez I love this forum!!!!
              Mind you, that's not to say that every light that uses 360 watts puts out twice the optical output as every 180 Watt light. Comparing apples to apples, one tungsten filament bulb is going to be extremely similar to the next. Apples to oranges, Florescent bulbs put out about 2-3 times as much light per watt, and LEDs can double that again. If we ever find a way to turn electrons into photons with 100% efficiency, one watt would probably vaporize your retinas.


              Comment

              • redwire
                Badcaps Legend
                • Dec 2010
                • 3906
                • Canada

                #8
                Re: 1.5 amps vs. 3 amps DJL vs. DJA

                These projector lamps are pushed pretty hard to get their 3200K color temp. CRI. They have only a 15hr life rating and I'm pretty sure they aren't halogen, as the halogen lamp (commercial) patent is 1959, took a while to make "hard" glass. I think 8mm projectors were popular in the late 1960's.

                Modern DLP projector lamps are 1,000-2,000 hour life rated but expensive. It might be worth hacking one into an old projector?

                Source: "Revolution in Lamps: A Chronicle of 50 Years of Progress" ISBN 0-88173-378-4

                Comment

                • apetay
                  Member
                  • Dec 2013
                  • 24
                  • USA

                  #9
                  Re: 1.5 amps vs. 3 amps DJL vs. DJA

                  Originally posted by mockingbird
                  Is this by any chance for a Super 8 projector??? Are you digitizing reels?
                  Yes indeed on both accounts- I'm digitizing some early 70's home movies for my Mom's birthday.

                  This project's been on the back-burner for a long long time. I've considered trying to wire in some LED's, but 15 hours of standard bulb life would likely get me by...
                  3 repairs under my belt, 3 repairs in progress

                  Comment

                  • apetay
                    Member
                    • Dec 2013
                    • 24
                    • USA

                    #10
                    Re: 1.5 amps vs. 3 amps DJL vs. DJA

                    Originally posted by LLLlllou
                    Mind you, that's not to say that every light that uses 360 watts puts out twice the optical output as every 180 Watt light. Comparing apples to apples, one tungsten filament bulb is going to be extremely similar to the next. Apples to oranges, Florescent bulbs put out about 2-3 times as much light per watt, and LEDs can double that again. If we ever find a way to turn electrons into photons with 100% efficiency, one watt would probably vaporize your retinas.


                    If it's one thing I don't need help with vaporized retinas! I'm sitting at 20/200 unassisted.
                    Last edited by apetay; 01-10-2014, 01:25 AM. Reason: continuity
                    3 repairs under my belt, 3 repairs in progress

                    Comment

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