reg plate light brighter when accelerating

[robbyb]

My bike has a tail tidy and an LED reg plate light.

When the bike is idling the LEDs are on but when I open the throttle and the revs go up the lights get much brighter and then dull again when back at idle.

Any ideas on what may be causing this?

Thanks
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Yamaha FZ8

[SQL]

Shows your charging system is working IIRC

[MarJay]

[RhynoCZ]

[robbyb]

Thanks for the replies, I feel much better now. I have only owned the bike for 21 hours
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Yamaha FZ8

[RhynoCZ]

[MarJay]

[WD Forte]

70w brake light?
jeez my main beams only 65W

Tail lights are usually dual filament 5/21W
thats 5w normal running and 21W braking
or 10/42W if you have 2 blubs

Adding a short term 42w load shouldnt cause concern
on a bike with a healthy charging system, but as we know,
leds will draw much less current.
A 20 led array running @ 20 mA each @14V is about 5 watts
or about 8 watts if they max out at 30mA each.

If leds are flickering you need to get a meter on it.
as it could be due to various things

Unlike blubs, leds have a turn on voltage which has to be passed
before they light up, whereas blubs will start to glow at say 8V
and they're not fussy about polarity like what leds is.

Leds dont like voltages over about 3V max and most use series
resistors to protect them
Too small a value and they light up early and may burn out
Too high a value means the threshold voltage goes up and they
wont light up fully until this is reached.

A bikes running voltage varies with rpm, load, battery condition etc
We have nominal 12V systems which in fact run closer to 14V
If the selected led resistors are biased towards a 14V supply
you may get flickering when the bikes not fully or
consistently reaching this threshold and the leds may be struggling to turn on at times.

There are various ways to configure the leds which can make a difference in performance and quality as well
Series parallel stuff like that, better quality lights will be in parallel
with individual resistors

[RhynoCZ]

I googled around, and there are two 21w/5w bulbs = 52w. I must have been mistaken. There's this:
https://www.consumabulbs.com/photo/380.jpg
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Kickstart]