3㎡ · operating table
4500
lm · 1500 lux
3 m² operating table — 4500 lumens
A room at 1500 lux needs 4500 lumens. That is 45 watts of LED, or 6 bulbs of 800 lumens.
Watts are not brightness
Equal lumens mean equal brightness; what changes is the electricity. An LED makes 100 lumens per watt, a filament 13 — nearly eight times apart. The monthly figure below assumes five hours a day for thirty days.
- LED100 lm/W45 W
- fluorescent60 lm/W75 W
- halogen20 lm/W225 W
- incandescent13 lm/W346.2 W
- Light reaching the floor
- 1500 lux
- Light you need
- 4500 lm
- Room size
- 3 ㎡
- In pyeong
- 0.9
- In 800-lumen bulbs
- 6
- A month of electricity
- 6.8 kWh
- Extra watts if incandescent
- 301 W
Several lamps beat one
The same lumens crammed into one fitting light the spot beneath and leave the corners dark. Splitting them across several 800-lumen lamps softens shadows, and one failure no longer means a dark room.
Nearby cells
Same room, other uses
Same use, other sizes
3㎡ · operating table
4500lm
4㎡ · operating table
6000lm
5㎡ · operating table
7500lm
6㎡ · operating table
9000lm
8㎡ · operating table
12000lm
10㎡ · operating table
15000lm
12㎡ · operating table
18000lm
15㎡ · operating table
22500lm
17㎡ · operating table
25500lm
20㎡ · operating table
30000lm
23㎡ · operating table
34500lm
26㎡ · operating table
39000lm
30㎡ · operating table
45000lm
33㎡ · operating table
49500lm
40㎡ · operating table
60000lm
45㎡ · operating table
67500lm
50㎡ · operating table
75000lm
60㎡ · operating table
90000lm
70㎡ · operating table
105000lm
80㎡ · operating table
120000lm
How to read this
- The light you need is lux times floor area; the use decides the lux.
- Watts are only that light divided by the lamp’s efficacy — not a measure of brightness.
- Bulb counts round up from one 800-lumen lamp.
- Ceiling height, wall colour and shades are not in this calculation.
Frequently asked questions
Q. How many lumens for a 3 m² operating table?
4500 lumens — 1500 lux times the floor area.
Q. How many watts should the lamp be?
45 W as LED, 75 W as fluorescent. An incandescent would draw 346.2 W — 301 W more.
Q. How many bulbs do I need?
6 at 800 lumens each. Spread them out rather than stacking them in one fitting.
Q. What does it cost to run?
On LED at five hours a day, 6.8 kWh a month.