Q Our small but heavily used bathroom at work is lit by four fluorescent lights, each of the tubes being 48 inches long. Would less energy be used leaving them on all day, vs. turning them on and off countless times throughout the day?

A "Turn the lights off," said Phil Smith with the Minnesota Office of Energy Security. That said, it can be difficult to get everyone in a work environment to turn off the lights.

A cost-effective option is to install an occupancy-control switch. There are different types of controls available. Some work better in some spaces than others. The generic bathroom intended for one occupant can have a simple wall-mounted passive infrared control in place of a switch. Restrooms with stalls are best controlled with "ultrasonic" switching mounted at ceiling height to accommodate the stall walls and doors.

Contact your electric provider, in this case Xcel Energy and its One-Stop Efficiency Shop, a small-business lighting program. It's specifically designed to address the needs of small-business decisionmakers when choosing more efficient lighting: The One Stop Shop offers a free lighting audit, financial resources at below-market rates to pay for improvements and a staff knowledgeable about lighting products and systems. For more information, go to www.mncee.org and click first on "Buildings and Facilities," then on "Commercial Lighting Program."

Readers wrote with suggestions for how to recycle large pieces of Styrofoam:

City of Coon Rapids recycles certain types of Styrofoam, especially if used in packaging appliances, TVs. The extended recycling program is available to anyone, not just residents.

Companies that take packing foam include:

Poly Foam Inc., 116 Pine St. S., Lester Prairie, Minn. (about 40 miles west of Minnetonka). Accepts clean, dry, white EPS packing foam only. Please call 952-445-4089 prior to delivery.

Plymouth Foam, 13900 Industry Av., Becker, Minn. (1-800-759-3626). Accepts clean, dry, white EPS packing or insulation foam. No tape, dirt, etc.

Send your questions to Fixit in care of the Star Tribune, 425 Portland Av., Minneapolis, MN 55488, or call 612-673-7032, or e-mail fixit@startribune.com. Past columns are available at www.startribune.com/fixit. Sorry, Fixit cannot supply individual replies.