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From: Don Y <blockedofcourse@foo.invalid>
Newsgroups: sci.electronics.design
Subject: Re: 9W LED inrush current
Date: Wed, 2 Oct 2024 17:32:30 -0700
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On 10/2/2024 1:32 PM, Don Y wrote:
> On 10/2/2024 12:13 PM, Martin Brown wrote:
>> On 02/10/2024 13:03, Pimpom wrote:
>>> On 02-10-2024 03:21 pm, Jan Panteltje wrote:
>>>> On a sunny day (Wed, 2 Oct 2024 12:01:47 +0530) it happened Pimpom
>>>> <Pimpom@invalid.invalid> wrote in <mN5LO.101241$CStb.23546@fx12.ams1>:
>>>>
>>>>> Does anyone have a figure for the switch-on inrush current of a typical
>>>>> 9W LED bulb? Preferably for 230/240V.
>>>>
>>>> Not sure wat the 'typical' circuit is, this is wha tI found in my LED bulbs 
>>>> from Cina:
>>>>   https://panteltje.nl/pub/LED_light_circuit_diagram_IMG_6925.JPG
>>>>    peak current is limited by the 1uF series cap at 50 Hz here.
>>>> There are so many different LEDs around,...
>>>>
>>> Ah, I should have formed my question more carefully. I know about those 
>>> early bulbs. They were the precursors to modern ones that use switching 
>>> supplies. These later models are the ones I mean.
>>
>> It is still likely to be fairly small since the cheap parts they use are not 
>> capable of more. Only way to be sure for a specific brand is to measure it. 
>> I'd expect no more than 2-3x its nominal operating current. The reservoir 
>> capacitor is seldom bigger than needed to avoid visible flicker and sometimes 
>> not even that on the cheap and nasties.
> 
> For lighting *installations* (i.e., not individual lamps), I think they
> use 100x the steady state current as an upper figure.  This is intended
> to cover model and manufacturer variations.
> 
> With multiple lamps on a branch circuit (or whatever is driving them),
> this can add up pretty quickly.
> 
>> Why do you need to know?

<https://adlt.com.au/resources/led-inrush-currents/>