Led's

Discussion in 'Tech/Mech General' started by Busman, Mar 9, 2014.

  1. Busman

    Busman Funster

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    Hello again, I'm after replacing the interior lights with LED's what would be the same as for sylvania cf se 9w/840, they have 4 pins.
    Thanks in advance.
    Dave
     
  2. GJH

    GJH Funster Life Member

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    I assume that is in a crown fitting. We had a couple in our Autoquest and, at the time, there was no direct replacement. I had to buy a Holder and LED bulb and convert the fitting - a fairly simple job of cutting the wire between the switch and ballast and wiring in the new LED and its holder.

    I don't know if there are direct replacements available these days. The only other way is to replace the unit itself (did that on the Burstner as the chrome on the fittings was a bit worse for wear).
     
  3. JeanLuc

    JeanLuc Funster

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    That lamp format is a fluorescent tube and therefore probably runs on 230V. That means that the lamp housing in your motorhome contains an inverter to change 12V DC into 230V AC. In order to replace with LEDs, you will need to strip out the inverter unit and install a 12V lamp holder to suit the LED of your choice. Alternatively you can buy LED strips and wire them directly to the 12V feed, bypassing the inverter circuitry.
    If it were me, I'd leave them alone as fluorescent lamps are pretty low consumption anyway.

    I have replaced halogen bulbs with LEDs in some locations, but where I have four fluorescent units (older style than yours as they are simple straight tubes) over the kitchen, table, and above each bed, I have left them alone.
     
  4. Busman

    Busman Funster

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    I think this is the way to go,
    Thanks for the info and GJH :thumb:
    Dave
     
  5. pappajohn

    pappajohn Funster Life Member

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    i beg to differ....
    An 11watt fluorescent uses 11watts plus any inverter losses.
    A 20watt led strip uses around 2watts....big difference
     
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  6. JeanLuc

    JeanLuc Funster

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    I'm struggling here. How can a 20 watt electrical consumer (LED strip or anything else for that matter) use 2 watts?

    And, for the record, the OP is referring to a 9W fluorescent tube, not 11W although I agree that the difference is small.
     
  7. scotjimland

    scotjimland Funster Life Member

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    LEDs lighting uses about 50% less power (watts) for a given light output (lumens) of a fluorescent.

    For comparison

    Watts of electricity used equivalent to 60 watt incandescent lamp.

    LED = 6-8 watts
    Fluorescent = 13-15 watts
    Incandescent = 60 watts

    I agree with JeanLuc.. and would leave the fluorescent as is..
     
  8. GJH

    GJH Funster Life Member

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    The crown fitting which I converted was definitely on the 12v circuit.

    It can easily be tested anyway - just see if the lamp will light when not on EHU.
     

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