Cast iron does have offensive and defensive utility, which could mean it's illegal in DC. I'd better check the code on that.

I amassed a collection of candle lanterns in the 1990s -- the UCO original single candle lanterns and the three-candle "candeliers" which put out a decent amount of light (the tops of them get very hot!)

The candles are still pretty cheap and last for nine hours. I have gobs of them on hand. Campmor and REI sell them.

My favorite candle lantern for home is one that LL Bean sold for a brief time back then, it's a replica of one that wives of mariners would put in their windows. Puts out a lot of light for a long while with a 6" pillar candle.

As Krista said, the cozy light of a candle is bonus in a power outage.

http://candlelantern.com/

Stable base - Sturdy 3-legged base helps stabilize the lantern on uneven surfaces.
Convenient Handle - Stainless steel handle makes the Candlelier easy to hang and carry.
Constant Flame Height - our unique spring loaded candle tube keeps the flame height constant while a small viewing window shows how much candle remains. Each candle burns for up to 9 hours.
Stove Capability - The heat shield provides a stove-like surface to boil small amounts of water, melt snow, or keep foods warm.
Economical - the Candlelier Lantern is affordable to purchase and economical to use. Other lanterns can cost up to $2.00 per hour to operate, the Candlelier costs only about 25 cents per hour.
Safe - No combustible fuels, no complicated starting procedures.
Reliable - no batteries to fail and replace, no mantles or bulbs to break.
Environmentally Friendly - no batteries or fuel cartridges to dispose.