Evening lights work fine, but you do need a dimmer light as well. As rdranch mentions, sudden darkness won't go over well.
We use both morning and evening lights. That way it's not necessary to mess around with adjusting artifical light as natural light decreases.
To do it this way, you would need two lights, one with a 40 watt bulb, and the other with about a 7.5 watt bulb.
You also need two timers that are each capable of setting two on/off cycles apiece.
We've found a 12 hour day is very adequate for egg production. 7am to 7pm. At this latitude in MN, I have the timers set as follows:
Sep.26 - The 40 watt light (with Timer #1) is set to come on at 6:45am and off at 9:00am. Then it comes back on at 5:15pm and goes off at 7:00pm.
----------- The 7.5 watt light (with Timer #2) is set to come on at 6:15am and off at 7:15am. It comes back on at 6:30 pm and goes off at 7:30pm.
Mar.10- The Evening Lights are no longer needed.
Mar.31- The Morning Lights are no longer needed.
Make no adjustments for Daylight Savings.
As you can see, the 7.5 watt slightly overlaps the 40 watt. That gives the hens time to adjust, both in morning and evening.
Good luck,
spot