LED driver question

Joined
17 Jan 2004
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Hi

I just installed 4 LED drivers to run some new kitchen cabinet lights
http://www.amazon.co.uk/gp/product/B008DFSU7O/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

2 of the drivers run 3 x 3w leds each
2 of them run 1 x 3w leds each
(because of the configuration of the cupboards)

All of them work fine, so no problems.
I'm curious though about what happens when switching them off (all via one wall switch) - the 3 x 3w leds switch off instantly, but there's a slight lag (maybe half a second) before the 1 x 3w leds switch off (one takes marginally longer than the other).
It's not a problem - I'm just curious as to what's happening electrically to give this effect.

Cheers
 
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Charge on output capacitor in the driver. 9w discharges them a lot quicker than 1w.
 

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