You will then be given the number of lumens needed and the equivalent of this in light bulbs. The wattage of a light bulb is the amount of energy the bulb consumes, and it's what you end up paying for when your electrical bill comes. The luminous flux Φ V in lumens (lm) is equal to the power P in watts (W), times the luminous efficacy η in lumens per watt (lm/W): Φ V (lm) = P (W) × η (lm/W) Watts to lumens calculation Alternatively, if you start with the lumen brightness that the formulas give you, compare it to 0.9 times the projector brightness at 16:10.
You'll find that information on the packaging.
Among the most common suggestions are to multiply the diagonal measurement of the screen by 1.6, 1.5, or 1.2 times to get the best seating distance, or divide the diagonal measurement by 0.6 or 0.84. Everything you need to know and get started with flexible LED strips.
Input your brightness needs, in footcandles: The reflectance of your walls will also play a role in the total amount of lighting needed. A halogen bulb, on the other hand, consumes only 72 watts for the same amount of brightness, making its efficiency 1,600/72 = 22 lumens per watt. Philip Schmidt is author of Install Your Own Solar Panels, The Complete Guide to Treehouses, and 18 other home-related how-to books.
If you start with the rule that Distance = ScreenDiagonal / 0.84, for example, the ScreenDiagonal = Distance X 0.84. Finally, LED bulbs, which are the most efficient, consume only 22 watts for an efficiency of 73 lumens per watt. Lumens: The total output of visible light from a light source is measured in lumens.
Brightness needs will depend the activity or work being performed in the space, as well as personal preference. For example, for a 120-square-foot room with a single overhead fixture with two light bulbs, each producing 800 lumens: Finding the lumens is easy. Lumen Estimation Calculator.
This means LED lights cost roughly five times less to operate than incandescent bulbs. Deciding on screen size is worth an article of its own. The packaging tells you the number of watts of power each bulb consumes and the number of lumens of light it puts out. But with an energy-efficient LED bulb, for example, you can get the same brightness with only 14 to 16 watts of electricity.
I'd ask the integrator to explain his rationale for the lumen spec he's recommending and see if he has a reasonable explanation aside from wanting to sell you a more expensive projector.
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