Can this light be set to only come on from dusk to dawn? This was installed by an electrician and he failed to leave the written instructions.

Woods 83660 security timer appears to be same/similar as Coleman 2001/Woods 49647
Instructions: Timer turns ON automatically at dusk
Use dial to set 4 possible options:
Off = always OFF; ON - always ON
Dusk-Dawn = ON at dusk, OFF at dawn
2,4,6,8 hours = ON at dusk, lights OFF 2,4,6,8 hours later
Woods Model 2001-49647 manual

Hello Gerald. Each switch has a function. the the test-1-5-10 allows you to set it to test or an on period of 1 or 5 or 10 minutes. The off-3-6-dusk to dawn allows you to turn it off completely, operate from dusk for 3 hours, operate from dusk for 6 hours or operate from dusk to dawn. By operate I mean turn on and then stay on for the number of minutes you set it to with the other switch.

what's nice about the test setting is that with it allows you to check and b sure that the light will come on during daylight by setting the one switch to test and the otner to any setting but off.

If you leave the 2nd switch set to off the first switch will not allow you to test it.

Joe

ST01C instructions are confusing, and are longer than space allowed for free answer.
Open following link for re-written instructions that might be clearer, with illustrations how the display should look.
http://waterheatertimer.org/ST01C-program.html#astro

To clear the timer, hold down on-off button and press reset button.
Release reset button and keep holding down on-off until INIT displays.

If you go through re-written instructions and get confused, add a comment with exact step where it is confusing and I'll pull out the ST01C I use for testing and maybe I can find what is causing the problem.

Add a comment with your experience so others with same-similar problem can benefit.

Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

You posted under Woods outdoor timer:
See this timer and other similar types to identify your timer for sure
http://waterheatertimer.org/Woods-timers-and-manuals.html#2001
If this is not your timer, look at other timers on the page and then add a comment, and I will post instructions for another timer.

Generally this type of timer each set the same way:
Instructions:
Timer tuns ON automatically at dusk
Use dial to set 4 possible options:
Set dial to Off , the timer is always OFF
Set dial to ON, the timer is always ON
Set dial to Dusk-Dawn, the timer is ON at dusk, OFF at dawn
Set dial to 2,4,6,8 hours, the timer is ON at dusk, lights OFF 2,4,6,8 hours later

You can also take advantage of fixya phone support.
Fixya expert will walk you through the steps for a price.

You posted under a photo that looks like Woods/Coleman cable 2001/49647 timer
See image at Amazon
http://www.amazon.com/dp/B00002NB2X/ref=asc

If this is not your timer, see all Woods timers and manuals at following link:
Add a comment any time
http://waterheatertimer.org/Woods-timers-and-manuals.html

Manual for Woods 2001-49647
http://waterheatertimer.org/pdf/Woods-2001-49647.pdf

Instructions:
Plug in timer, plug lights into timer, capacity 1875 watts
50-mini-bulb string of Christmas lights is 25 watts
Timer tuns ON automatically at dusk
Use dial to set 4 possible options:
Off = always OFF
ON - always ON
Dusk-Dawn = ON at dusk, OFF at dawn
2,4,6,8 hours = ON at dusk, lights OFF 2,4,6,8 hours later

That sounds like the Woods 17321 Dusk-to-Dawn yard stake
Product image:
http://www.amazon.com/Woods-17321-Outdoor-3-Outlets-6-Foot/dp/B000BHN4H8

Manual
http://waterheatertimer.org/pdf/Woods-17321.pdf

If this is not your timer, check following page:
http://waterheatertimer.org/Woods-timers-and-manuals.html

Instructions:
Yard stake control outlets, and turns ON automatically at Dusk
Rotate dial to set options:
Rotate to OFF > outlets OFF
Rotate to ON > outlets ON
Rotate to Dusk-dawn > outlets on at dusk and off at dawn
Rotate to 2 4 6 8 > outlets on at dusk and off 2 4 6 8 hours later

Woods makes several outdoor timers:
http://waterheatertimer.org/Woods-timers-and-manuals.html

Image that shows with this post is Woods model #49647.
Below are instructions for #49647 timer.

If your timer is different, add a comment with model number and I'll post instructions for that timer.

Woods model #49647 is outdoor timer with photoelectric control that turns timer ON at dusk.
There are 4 possible settings that show on dial.
Rotate dial to make timer selection.
OFF = timer is OFF full-time until you change dial.
ON = timer is ON full-time until you change dial.
Dusk-Dawn = timer turns ON at dusk and OFF at dawn
2, 4, 6, 8 hours = timer turns ON at dusk, and turns OFF 2, 4, 6, or 8 hours later.