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Bulb lifespan problem

Discussion in 'Landscape Lighting' started by lightsaber, Dec 3, 2005.

  1. lightsaber

    lightsaber LawnSite Member
    Messages: 16

    Recently have gotten a few callbacks to replace some mr-16 lamps and a couple bipin lamps. These lamps were in from 3-5 months. Voltage is between 10.8-12, hub method, so I am wondering if anything else could be causing premature lamp burnout.
  2. lilmarvin4064

    lilmarvin4064 LawnSite Senior Member
    Messages: 757

    not sure, but if I were you, I would consider using LEDs instead. Never need to be replaced (maybe every 10 to 20 years)
  3. YardPro

    YardPro LawnSite Gold Member
    Messages: 3,570

    could be voltage spikes in the main line..
    the transformer is merely a 10:1 stepdown, so if there is a spike in the incoming line voltage, it will be carried out through the lines.
  4. SprinklerGuy

    SprinklerGuy LawnSite Bronze Member
    Messages: 1,778

    On the MR16 bulbs maybe someone touched the bulb with a bare hand? The halogens don't like that and can cause a hot spot...causing lower life spans.

    BTW...I hardly believe the life expectancy claims of those bulb manufacturers...you shouldn't expect to get the hours they claim on every bulb.
  5. Az Gardener

    Az Gardener LawnSite Gold Member
    Messages: 3,899

    When a light burns out in a hub system all the other lights in the hub spike which shortens the life if the bulbs. (I don't like hubs) Then you have a domino effect, lite burns out-spike another burns out-another spike. I believe the fewer lights on the hub the bigger the spike too, so as you lose lights you loose the next light faster. Betcha that wasn't in the literature. The way they rate a bulbs lifespan is; get 100 bulbs lite them up if 50% of them last 1,000 hours they have a 1,000 hour life span. Sucks for you if you get the underachievers. Try to lower the voltage, drop down a tap from 13 to 12 or whatever.
  6. SprinklerGuy

    SprinklerGuy LawnSite Bronze Member
    Messages: 1,778

    I agree about the hub system...I have never trusted it..never installed one either. Those hubs have caused fires in extreme circumstances.....dry pine needles and well lights....using a highvoltage tap and only one unburned bulb left...creates a ton of heat....be careful with the hub system.
  7. lightsaber

    lightsaber LawnSite Member
    Messages: 16

    Thanks Guys, for the input, Touching mr-16 with glass cover shouldn't create a problem correct. I'm hoping its just bad lamps here and there as I recheck voltages and see no problems. May switch to the 10,000 hr. lamps available.
  8. SprinklerGuy

    SprinklerGuy LawnSite Bronze Member
    Messages: 1,778

    my bad...some of the halogens are unsealed..mr16 are sealed...and yes, touching them is fine....
  9. Frog Lights  LLC

    Frog Lights LLC LawnSite Member
    Messages: 191

    Some bulbs are not of very good quality and will have a short life. Other reasons are higher voltage, water and dampness from sprinklers and rain. I have noticed if the bulb is not well seated in the holder it will generate heat and fail sooner. Please check the number of hours it is on during the evening, some customers will leave it on all night.
  10. NightScenes

    NightScenes LawnSite Silver Member
    Male, from Kingsland, Texas
    Messages: 2,214

    When I first install a job I use only 10,000 hour Ushio MR16 lamps. I used to use the cheap lamps from my distributor and I was changing lamps all the time. NEVER use Satco lamps!!! I balance the voltage to the lamps between 10.8 volts and 11.5. I have had very few problems since I changed to Ushio.

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