I've Had the Time of My Light

Ask Umbra on light timers 5

Q. Dear Umbra,

So I’ve gotten a lot better at turning out the lights when I’m not in the room. I’ve still got some work to do in terms of turning off power strips when I’m not using appliances though. I was thinking about this last night and I remembered this contraption at my grandparents’ house that is preset to turn lights on and off at particular hours during the day. I haven’t had much luck figuring out what these devices are called to determine where to get them, or if they are worth it. Could you look into this for me and let me know about any other tricks for those of us that want to be better about their electricity usage, but aren’t always very good about putting ideals into practice.

Jonathan C.
Coquitlam, B.C.

A. Dearest Jonathan,

light timer Automatic for the people.iStockThey are called light timers. At least, if you walk into a hardware store and ask for the light timers, you will be shown to these objects. I have two that are simple square boxes with a 24-hour dial. You plug the box into the wall, plug the lamp into the box, set the color-coded plastic prongs by the desired off and on times, and that’s it. They shouldn’t cost more than five dollars. There are also digital versions, slightly more costly at about $12 and up. And there are versions in which the timer is embedded in a power strip, also fairly cheap at around $20 (these last two, and others mentioned below, are viewable during an Amazon window-shopping trip if you can’t find them at the hardware store).

It is feasible that a hardware store employee might lead you to another cheap and handy light timer, a photosensitive attachment for outdoor lights. This would be good for a porch light. Again, all about me: the one I have is a little tube with threading at both ends, like a lightbulb bottom with no light bulb in it. One end screws into the light fixture, the other receives the light bulb. In between is a magical eye that senses whether there is darkness or light. You leave the porch light switch on, and the magic eye does all the work of turning the bulb on and off at the appropriate times.

You might also benefit from one of the higher-end power strips of which I have written before. These do smart things like, if you turn off your computer, the strip turns off all affiliated appliances. Or, if you leave the room, they turn off the appliance. Of course you can use the five-dollar light timer to turn off your computer peripherals as well.

If you are up for a little electrical work, you could install a more complicated electric timer wired directly to an electric box (the thing hidden behind a wall switch). I’ve never used one of these, but it sounds a bit like a programmable thermostat. Or, install a timed wall switch. Perhaps you’ve seen these in hotel bathrooms, where they might run the lights or the fan. Instead of a normal on/off toggle, the switch has four or so settings of 10 minutes, 20 minutes, 40 minutes, 60 minutes, and hence turns itself off after an allotted time.

I like all of these things, even the ones I haven’t used. They are tiny robots that do our work for us, and also do the work for our houseguests. Have fun at the hardware store, whether virtual or physical.

Switchily,
Umbra

 

 

Yours is to wonder why, hers is to answer (or try). Send your green-living questions to Umbra.

Umbra Fisk is Grist Research Associate II, Hardcover and Periodicals Unit, floors 2B-4B.

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  1. scatter Posted 4:09 am
    27 Apr 2009

    Take care with electronic timers and PIR systems when used with CFLs. Many of these aren't suitable for use with CFLs because they allow a trickle of charge through which builds up enough to allow the CFLs to discharge with a flash and can shorten their life (the packaging should indicate if they are suitable though). Mechanical timers should be fine.
    1. amber rinderknecht Posted 9:17 am
      27 Apr 2009

      what is PIR and CFL?
      1. scatter Posted 11:26 am
        27 Apr 2009

        Sorry Amber, too many TLAs.... :)
        CFL = Compact Fluorescent Lamp (energy saving bulb)PIR = Passive Infra Red (the kind of sensors you get on outdoor security lights)
  2. slsessions Posted 9:48 am
    27 Apr 2009

    You can also purchase heavy-duty appliance timers, which are great for hot water heaters (though not necessary for on-demand H2O heaters).  It is easy to experiment to determine how much time you need and when (your own "peak hot water usuage"), and keep the heater on only a little before and during those times.  We have an 80gal tank (for eventual upgrade to solar heating), and the boiler runs 30min/day in summer.  In the winter, we run it in morning before showers and in the evening (it also supplies heat for radiant floors).  On heavy cleaning days (or really cold days), you can manually turn the timer on and put in an "off" tab to turn it off.  Works great and saves energy!
  3. sherrieh's avatar

    sherrieh Posted 12:23 pm
    27 Apr 2009

    Has anyone ever compared the energy efficiency of the different types of timers themselves?  I would assume the motor in the dial type makes them somewhat less energy efficient, but would be curious if anyone has verified or contradicted that with a load meter.

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