What will 10,000 Lumens light up ?

Will 10,000 Lumens light up a 40ft x 20ft room at daylight levels ?

i.e. if i had 120pcs. XR-E emitters driven @ 400mA spaced 1 foot apart with no secondary optics in 3 strings of 40 and mounted on a 1 inch square aluminium hollow section with the strings spaced 5 feet apart on the ceiling will they light the room at daylight levels ?

in theory i would get 10,800 lumens with only 150W. of course one would have to deduct losses from the driver.

Get three of these 150w halogen floods to try with, i think that they normaly are about 3-4k lumens each...

Full sunlight can be over 10000 lumens per square foot so the answer is no. Even just skylight is something like 1000 lumens/ft². That being said, I find 100 to 200 lumens/ft² to be a good lighting level for indoors as it is pretty close to the light levels most rooms receive during the day from sunlight and skylight.

LEDs do offer interesting possibilities to eventually do what you suggested without inordinate power consumption. For example, should we eventually get to 250 lm/W efficiency levels then you can light a 100 square foot room to daylight levels (i.e. 1000 lm/ft²) using only about 400 watts. This is less power than many incandescent chandeliers now use to give a fraction of the light.

At this point in time the most cost efficient way to brightly light a room is to use 4 foot T8 tubes in as many fixtures as needed.

ok i currently have 12 x 4ft 40W tubes and 2 x 6ft 65W tubes and 10 x 36 W CFL's half of their light is wasted as they are placed in shrouds which cover half of their emitted light - how many lumens would that be ?
The room is a showroom so a good amount of light is needed.

Amonra said:

ok i currently have 12 x 4ft 40W tubes and 2 x 6ft 65W tubes and 10 x 36 W CFL's half of their light is wasted as they are placed in shrouds which cover half of their emitted light - how many lumens would that be ?
The room is a showroom so a good amount of light is needed.

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Before fixture losses that's roughly 60,000 lumens. Assuming 25% fixture losses overall it's 45,000 lumens, or about 55 lm/ft². That is kind of dim for a showroom. A good four tube 4 foot T8 fixture will give about 10,000 lumens after fixture losses while consuming approximately 110 watts. For the same power budget you can put in about ten such fixtures and more than double your light output.