BrightHome buying guide · Updated November 6, 2026
How many lumens should a replacement bulb have?
Use your current light as the starting point.
Record what works today
If the existing light is comfortable, begin with the lumen output printed on that bulb or its packaging. If the room feels dim, decide where you need more light before increasing every bulb’s output. A reading chair, counter or workbench may benefit from a dedicated task light. Consider the shade and the direction the fitting sends light as well as the number on the box.
Compare equivalent output
For common general-purpose incandescent replacements, useful reference points are about 450 lumens for a 40 W bulb, 800 for 60 W, 1,100 for 75 W and 1,600 for 100 W. Those figures are brightness comparisons. The actual electrical wattage of the LED is a separate specification. Follow your fixture’s rating and installation instructions when selecting a replacement.
Account for multiple bulbs
For a three-bulb fitting, three 800-lumen bulbs have a combined nominal output of 2,400 lumens. That does not describe the brightness at every point in the room. Shades, ceiling height and where the light lands change the result. Write down the number of bulbs and their output so you can compare two options on the same basis.
Make a small trial
When changing a whole room, try a small quantity before buying a large multipack. Read or work under the light after dark. Check for glare from your usual seat and compare the output with adjacent rooms. If you use a dimmer, verify compatibility separately.
Reference for the specifications discussed above. ENERGY STAR brightness reference