Sorry if this is a noob question. I'm trying to build a very bright light by combining multiple light bulbs together with socket splitters. My thinking is simply to take three 7 in 1 light socket splitters and combine them to give 5 + 7 + 7 = 19 total sockets. If I put a 1000 lumen led light bulb in each of these sockets, will I in practice have a 19000 lumen light or is there some reason in practice why I might end up with much less than that? (i.e. is my calculation naive).

Edit: here's what I mean by a light socket splitter:

6 in 1 light socket splitter

Idea is that I would connect another splitter in two of those slots instead of a bulb (assuming this works?). I may replace the ceiling bulb or possibly use a lamp stand in order to move it closer and increase the actual lux that's hitting my face.

The bulbs would be probably be 17W LEDs (maybe higher if I can find them). I'm in the UK, where the voltage limit is 230V.

  • \$\begingroup\$ Not noticeably, but you should calculate the current, make sure it's less than the breaker rating (if not, you need a wiring upgrade [not a breaker upgrade!]) \$\endgroup\$
    – user253751
    Nov 26, 2020 at 16:30

2 Answers 2


First, is it possible?

A 1000 lumen LED light usually draws about 10 W. So you would draw a total of 19 * 10 = 190 W. If you are in a 220-240 V country, that's about 1 A. This is definitely within the allowed power on a single socket (usually 16 A). Consider that you hair drier probably draws 10 times as much.

Next, do you get a total luminous flux equal to the sum of each?

It depends on the shape of the lights. If the bulb emits light in all directions, some of it will be blocked by other bulbs in the path, or by whatever hardware you used to hold all those lights. Some of that will be reflected, some will be absorbed (though unless your bulbs are very peculiar, or you painted everything black, I would expect that to be a very small proportion). If all bulbs emit in the same direction (away from where other bulbs may be), they would indeed add up.

Note how many LED light bulbs are actually composed of a lot of small LEDs. This is quite common practice.


Note that this answer was written before you added the picture and the mention of 17W LEDs. I thought you were talking about regular power strips, rather than these weird splitters I had never seen. You would need to check the max current they allow, which may be much lower than what a power strip allows. Also take into account the higher power (and thus current) compared to my assumptions.


Lighting fixture in which you gonna put that splitter has a wattage restriction. If you stay in that limits, it is Ok.


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