He is referring to the canopy lights used at service stations/convenience stores. The ones mounted under the gas pump canopies that put out so much glare/light. It is known as the sparkle factor and many big gas stations have, over the past ten years increased the number of canopy lights to the point that some cities are now regulating them as to how much light can leave the property.
These lights are designed for use in damp locations, and are available in a number of different wattages from about 175w up to 400w or more.
For something no larger than a 22x24, I would suggest several 4 ft T8's with 5K or 6K bulbs. Several of these fixtures will give you much more even lighting than a couple of canopy lights in a building this small. Given something higher and larger, MH lights work OK but are quickly becoming obsolete. I have 12 ea 400w low bay MH lights in my 60x60 metal building, but someday in the future they may well get changed out to something more energy efficient. I used MH lights because I liked them and I got a decent price on used fixtures ($40 ea), but they hog the electricity, I figure it costs about a dollar an hour to turn them all on.
Here is the thread about my lighting, scroll thru it to find pics of the lighting installed.
http://www.garagejournal.com/forum/showthread.php?t=21048
Charles
