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It's called a Soleira sun simulator system. Briton House, a privately-owned retirement home in Toronto, has one.
There, residents can escape on a tropical break without ever leaving home.

The room is equipped with a simulated beach, with sand, the sound of surf, and plenty of warmth and sunshine thanks to a light system that simulates the summer sun

Eric Pflanzer runs the Canadian office of the Swedish-based Soleira Sun.
He says the system's computer and light system reproduce the sun's full-light spectrum, but it also reduces the harmful effects of UV rays.

Theoretically, the lights allow the skin to produce vitamin D, but without the damaging effects of tanning.
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This one is in Toronto, others being built in Quebec City and Niagara

Update Nov 25, 2011

Their system unfortunately has very little UV: about 1/3 that of the noon-time sun in Canada
They did not indicate how much UVA vs UVB
Even if we assume that they have not reduced or eliminated the UVB, seniors in t-shirts and shorts would need > 6 hours per day to get adequate vitamin D.
Recall that UVA produces tanning, UVB produces vitamin D.
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See also VitaminDWiki

• All items in Shut-in and Vitamin D 39 items
• Hip fractures reduced 2X to 6X with just 10 minutes of sunlight daily – RCT 2003-2010
• Vitamin D bulb for use in the home - or perhaps office
  • probably 1% of the UV, but at much less than 1% of the cost has the following table and photo

Source	cost	$/use 7	UVA 5	UVB	Time4	Eye protect	Notes
Tanning bed - salon	$20,000	$20.00	4.0	0.2 1	20	dark goggles	Drive to salon - skin can wrinkle if too much UVA
Tanning bed - home	$2,000	$1.00	2.0	0.3	30	dark goggles	Too big for home? - skin can wrinkle if too much UVA
Psoriasis lamp	$500	$0.25	1.0	0.3	30	dark goggles	Prescription typically - If too much: wrinkle and skin cancer
SAD 6	$100	$0.05	0.0	0	never	none 2	No vitamin D
Vitamin D Bulb	$50	$0.03	0.1	0.1	100	none 2	Can read while getting vitamin D 3
Sun	0	$0.00	1.0	1.0	10	none 2	Excessive sun can cause skin wrinkles and cancer

• No – 10 minutes per day of sun-UVB is NOT enough which had the following graphic