When talking about recessed lighting (or for that matter any lighting) is is important to understand what are watts and what are lumens.
A watt is a measure of power.
It is what you pay for when you pay your electric bill.
A lumen is a measure of light intensity.
Lumens are generated as watts are consumed.
Light bulbs have been labeled with the number of watts they consume for years and years.
With the push to develop and implement more energy efficient lights, bulbs are now labeled with lumens as well as watts.
Here is a sampling of light bulbs from various light bulb stores on the Internet, and the last column is a calculation I did to identify the lumens per watt:
|Bulb type||Watts||Lumens||Lumens per watt|
As you can see, the clear winners of the lumens per watt competition is fluorescent and LED, which is why they are being pushed so hard as energy efficient.
I predict LED will eventually win as about three or four years ago Siemens succeeded in producing 1,000 lumens in a single LED, but for some reason bulbs made from this technology are not yet (to my knowledge) available on the market.
In summary, watts is what the bulb consumes in power while lumens is the light energy produced, so the ratio of lumens to watt indicates how energy efficient the bulbs are.
And speaking of recessed lighting for your home ….. we would love to install some for you when you live in or near San Jose.