Thread: How can I set lights to turn on and off automatically every 12 hours?

I'm wiring some lights in my room to grow tomatoes, and I need them to cycle on and off every 12 hours. I'm not always able to be home at the right times, so is there a way that I can wire something with them that will let me set it to 12 hour cycles?
Any input is appreciated!

You can get a timer at most house ware stores that allow you to set a given period of time. You could start at noon and shut off at midnight. I use them on lamps when I go away.

get one of these: http://www.google.com/search?q=wired+in+light+timer&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-USfficial&client=firefox-a#sclient=psy&hl=en&client=firefox-a&rls=org.mozilla:en-US%3Aofficial&biw=1280&bih=795&tbm=shop&source=hp& q=in+wall+light+timer&aq=f&aqi=g1&aql=&oq=&pbx=1&b av=on.2,or.r_gc.r_pw.&fp=435e185a007639bf

i dont know how expensive they are, but a local walmart, lowes or home depot will have them. just ask someone when you walk in and they'll help you find it.

just get a timer from a hardware store for the lights to grow "tomatoes".

There are light timers. You plug them into an outlet and then plug the light into them. Jewish individuals use them on Shabbos because they can't use electricity.

An example: but definitely not the only type.

http://www.lowes.com/pd_154182-95325-LW61220_4294857038_4294937087_?productId=3126685&N s=p_product_prd_lis_ord_nbr|0||p_product_quantity_ sold|1&pl=1&currentURL=%2Fpl_Timer%2B_4294857038_4 294937087_%3FNs%3Dp_product_prd_lis_ord_nbr|0||p_p roduct_quantity_sold|1

You will need this kind of "Honeywell Econoswitch RPLS740B 7-Day Solar Time Table Programmable Switch for Lights and Motors" and you can buy it here,
http://www.amazon.com/Honeywell-Econoswitch-RPLS740B-Programmable-Switch/dp/B004AP92N2/ref=pd_sxp_grid_i_0_1

The Honeywell RPLS740B 7-Day Solar Time Table Programmable Switch for Lights and Motors helps you save money by ensuring that your lights come on only when you need them. This eco-friendly unit works with incandescent, halogen, and fluorescent lighting, making it ideal for indoor or outdoor use. It also works with ceiling fans, bathroom fans, pond pumps, and pool pumps.

Featuring three operating modes and seven programs, the 7-Day Solar Time Table Programmable Switch for Lights and Motors allows you to create programs that best suit your lifestyle. Its sleek design fits flush with standard wallplates, while the large screen and backlight provide clear viewing, even at night. Easy to install and equipped with an automatic daylight saving update, this switch works to keep energy costs down even when you're not around.