06-08-2011, 08:19 PM
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#1
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GL Member
Join Date: Apr 2011
Location: Soldotna, Alaska
Posts: 348
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led question
so if I have 4 leds (all run Forward Voltage (V) : 3.2 ~ 3.8) so If i run them all onto the same power and ground wire. I wont need any resistors as long as I run all for to the same power/ground wire? right?
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'00 Alero GL - 11X,XXX miles
-4500K/6000k/30000k(purple) HID's Hi/Lo/Fogs
-Carbon fiber pillars, door handles, and Gas cover
-Optima yellow top. This battery went end over end in my jeep (not strapped down) 13 times for 75 feet. and now is in my alero. one tough battery
-Cleared Corners/Painted Bezels
Last edited by the_weber : 06-08-2011 at 08:25 PM.
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06-08-2011, 08:45 PM
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#2
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Gone
Join Date: Mar 2004
Location: Lockport Ny
Posts: 19,244
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yes. You will run them in series. power wire connected to the first led's power lead. The ground on the first connected to the power of the 2nd. Ground of the 2nd connected to the power on the 3rd and so on.
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06-08-2011, 08:46 PM
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#3
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GL Member
Join Date: Apr 2011
Location: Soldotna, Alaska
Posts: 348
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what if i have a power and ground coming off of each one spliced into a power and ground?
__________________
'00 Alero GL - 11X,XXX miles
-4500K/6000k/30000k(purple) HID's Hi/Lo/Fogs
-Carbon fiber pillars, door handles, and Gas cover
-Optima yellow top. This battery went end over end in my jeep (not strapped down) 13 times for 75 feet. and now is in my alero. one tough battery
-Cleared Corners/Painted Bezels
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06-08-2011, 09:09 PM
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#4
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Gone
Join Date: Mar 2004
Location: Lockport Ny
Posts: 19,244
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then you are powering each with 12V and they are in a parallel setup. You'll need a resistor on each.
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06-09-2011, 03:23 AM
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#5
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GL Member
Join Date: Apr 2011
Location: Soldotna, Alaska
Posts: 348
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all four lit up for about a half second and blew. did it your way by running in series (which is what i should have done to start). Will try to do 5 tomorow instead and see if that gives enough resistance. Burned my hand and its 1130 pm here so I'm done for the night. thanks for the quick answer
__________________
'00 Alero GL - 11X,XXX miles
-4500K/6000k/30000k(purple) HID's Hi/Lo/Fogs
-Carbon fiber pillars, door handles, and Gas cover
-Optima yellow top. This battery went end over end in my jeep (not strapped down) 13 times for 75 feet. and now is in my alero. one tough battery
-Cleared Corners/Painted Bezels
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06-10-2011, 05:59 AM
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#6
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GL Member
Join Date: Apr 2011
Location: Soldotna, Alaska
Posts: 348
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so I used four and the 5th one didnt light up. because like .2 volts is getting to it by the time the other 4 get there power. but tomorow i will put htm all in and see how it looks. I made some for both cupholders and 2 for under the radio. Then I made 2 clusters for 4 to go in the foot wells. Cherrington did you dremel yours for the cupholders or leave them rounded?
__________________
'00 Alero GL - 11X,XXX miles
-4500K/6000k/30000k(purple) HID's Hi/Lo/Fogs
-Carbon fiber pillars, door handles, and Gas cover
-Optima yellow top. This battery went end over end in my jeep (not strapped down) 13 times for 75 feet. and now is in my alero. one tough battery
-Cleared Corners/Painted Bezels
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06-10-2011, 07:43 AM
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#7
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GLS member
Join Date: Apr 2010
Location: Valley City, ND
Posts: 999
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You can only really run four in series, otherwise you're cutting the voltage too low on them (which you all ready figured out). For that fifth one get the proper resistor (if you got them from oznium it should tell you what ohms you need), and hook the 5th LED with resistor to a separate power line.
__________________
2003 Alero GL2 LA1: pacesetter cat back, Energy Speed WAI, Magnaflow downpipe/cat, tinted tail lights, and polished letters on intake manifold.
1987 Honda Rebel 450
1967 Buick Riviera 430 Wildcat: roadworthy but needs restoration.
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06-10-2011, 03:42 PM
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#8
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GL Member
Join Date: Apr 2011
Location: Soldotna, Alaska
Posts: 348
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why not just cut the voltage down? Idc if the 5th one lights up.
__________________
'00 Alero GL - 11X,XXX miles
-4500K/6000k/30000k(purple) HID's Hi/Lo/Fogs
-Carbon fiber pillars, door handles, and Gas cover
-Optima yellow top. This battery went end over end in my jeep (not strapped down) 13 times for 75 feet. and now is in my alero. one tough battery
-Cleared Corners/Painted Bezels
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06-10-2011, 06:13 PM
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#9
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Gone
Join Date: Mar 2004
Location: Lockport Ny
Posts: 19,244
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resistors are cheaper than leds. which is why Luca's method is better.
I dremeled them, so they had a flush appearance when I put epoxy in the hole to seal them from water/moisture.
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