When building small space ships in Factorio, energy efficiency becomes important.
I used one accumulator to power each type of inserter, then looked at how many items they moved.
(See also: Testing Factorio assembler energy efficiency)
Here are the results, with no stack size limit:
| Icon | Type | Stack size | Items moved |
|---|---|---|---|
 |
Yellow | 4 | 2800 |
 |
Red | 4 | 2720 |
 |
Blue | 4 | 2400 |
 |
Green | 12 | 2544 |
And with the stack size forced to 1:
| Icon | Type | Stack size | Items moved |
|---|---|---|---|
|
Yellow | 1 | 700 |
|
Red | 1 | 680 |
|
Blue | 1 | 600 |
|
Green | 1 | 212 |
EDIT: I realized that four bulk inserters actually draw more than the 300kW of a single accumulator which actually puts them in a low-power situation. I repeated the bulk inserter tests with only a single inserter and surprisingly I got the exact same results (212 / 2544).