Member Since: 06 Apr 2006
Location: usually in the pub
Posts: 398
leds again
Yesterday I fitted a set of U38020R S & T leds from Ultraleds & was well impressed until I took it for a run last night & as soon as I touched the brake pedal the cd was drowned out by static. Further checks showed that when on a weak radio station static was coming through, but as soon as I turned off the lights it stopped. Also, bands of interference were running horizontally on the Tv screen when the lights were on, and an electrical hum was coming out of both the n/s and o/s light assembly. I know a lot of folks here have installed them trouble free so I wonder why mine are having such an effect. Anyway, I've contacted Ultraleds & they've offered me a refund.never drive faster than your guardian angel can fly
current motor RRsport hse
prev. cars TD5
3 Ford Explorers
2 Ford Mavericks
Sierra 4x4
That's exactly the trouble I'm having - what model of radio do you have? I've got the base model single CDunit - I wonder if they just affect that model? It's a shame 'cos they look great!Previously:
2005 D3 2.7 TDV6 S
1984 90 2.25 Petrol CSW
1992 90 200TDi Hard Top
1995 Discovery ES 300TDi
2003 90 TD5 Truck Cab
11th Apr 2008 9:54 pm
Nuts06
Member Since: 23 Feb 2008
Location: Nice (French Riviera)
Posts: 116
Hello,
I fitted exactly the same set of U38020R from Ultraleds and no problem at all !
My audi system is a premium HK Logic 7...
Member Since: 06 Apr 2006
Location: usually in the pub
Posts: 398
Weird, or what! Why are they ok on some & not on others? Mine is the 2008 HSE with tv.never drive faster than your guardian angel can fly
current motor RRsport hse
prev. cars TD5
3 Ford Explorers
2 Ford Mavericks
Sierra 4x4
13th Apr 2008 4:45 pm
Ken
Member Since: 20 Feb 2006
Location: Here
Posts: 10865
Try again mines a 08 HSE with TV and all is fine
13th Apr 2008 4:52 pm
cliveaff
Member Since: 05 Sep 2006
Location: Eastbourne
Posts: 328
I have the base radio, with the base car.
And I have no problems with them.Land Rover Dicovery 3. 5 Seats.
With side Steps, And rubber floor mats and rubber load space cover.
Front and Rear Mud Flaps.
Light Guards.
Engine Re-Map
Alpine Mobile Media Station. With SatNav.
Xenon head lights
Old Man Emu Suspension
Triumph Sprint RS 1050
Discovery 1 300tdi 1995
I'm wondering if there's a problem with just one of the LEDs, causing interference. I'm waiting for an email back from Ultraleds.Previously:
2005 D3 2.7 TDV6 S
1984 90 2.25 Petrol CSW
1992 90 200TDi Hard Top
1995 Discovery ES 300TDi
2003 90 TD5 Truck Cab
"we have never had any problems with these bulbs causing radio interference theres nothing in them apart from a resistor that could cause this"
Hmmm Previously:
2005 D3 2.7 TDV6 S
1984 90 2.25 Petrol CSW
1992 90 200TDi Hard Top
1995 Discovery ES 300TDi
2003 90 TD5 Truck Cab
14th Apr 2008 10:29 am
stapldm
Member Since: 11 Sep 2006
Location: Swine Town
Posts: 2330
ridgeback_moor wrote:
Helpful reply from Ultraleds:
"we have never had any problems with these bulbs causing radio interference theres nothing in them apart from a resistor that could cause this"
Hmmm
I don't think that's quite right. Their own website states for these bulbs have:
Ultraleds wrote:
Power Driver Built in to give a constant Ultrabright Light. From 12 -16V these bulbs cannot be overpowered (unless more than 16V applied)
This implies there's a voltage regulator in there, and this could be the cause of your interference.Dr. Ian Malcolm:
"Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should."
Transgenic tomato anyone?
Yes, there's definitely more than just a resistor in them - it maybe the voltage regulator but i read some of these LED lamps have the brightness controlled by Pulse Width Modulation (PWM) so I think that could be a cause of the interference too. Odd that it affects some vehicles and not others.Previously:
2005 D3 2.7 TDV6 S
1984 90 2.25 Petrol CSW
1992 90 200TDi Hard Top
1995 Discovery ES 300TDi
2003 90 TD5 Truck Cab
14th Apr 2008 10:05 pm
stapldm
Member Since: 11 Sep 2006
Location: Swine Town
Posts: 2330
Almost certainly it is a switched mode affair which is indeed PWM. This could mean that those cars producing slightly lower average volts at the alternators may see less interference effect than those cars with a higher output. Did you get through a lot of ordinary bulbs before the switch to LED?
In current outside temperatures my alternator only hits 14.5V for a few seconds before dropping back to it's usual 13.5V.Dr. Ian Malcolm:
"Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should."
Transgenic tomato anyone?
It used a couple of normal bulbs but not too bad. I'll check if it has the interference whilst the engine's off, which may show if it's a voltage problem?Previously:
2005 D3 2.7 TDV6 S
1984 90 2.25 Petrol CSW
1992 90 200TDi Hard Top
1995 Discovery ES 300TDi
2003 90 TD5 Truck Cab
14th Apr 2008 10:46 pm
pko
Member Since: 06 Apr 2006
Location: usually in the pub
Posts: 398
Just to add to the confusion, I replaced my front sidelights with tower leds from my local accessory shop, & there was no interference problem with them, it was only when I fitted the rear ones from Ultraled that I got the problem. I was also getting an electrical humming sound from both the o/side & n/side of the rear sets when the sidelights were on. I've now sent them back for a refund, so Ultaled can now confirm they have had problems with them.never drive faster than your guardian angel can fly
current motor RRsport hse
prev. cars TD5
3 Ford Explorers
2 Ford Mavericks
Sierra 4x4
Do any other companies make something similar to the Ultraled 20 LED version? I'll be returning mine soon if I can't pin it down to 1 faulty LED, but I don't want to go back to normal bulbs if I can help it.Previously:
2005 D3 2.7 TDV6 S
1984 90 2.25 Petrol CSW
1992 90 200TDi Hard Top
1995 Discovery ES 300TDi
2003 90 TD5 Truck Cab
15th Apr 2008 12:41 pm
pko
Member Since: 06 Apr 2006
Location: usually in the pub
Posts: 398
hello, ridgeback, just out of interest, do yours make an electrical hum when they're on?never drive faster than your guardian angel can fly
current motor RRsport hse
prev. cars TD5
3 Ford Explorers
2 Ford Mavericks
Sierra 4x4
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