89-91 LMC headlight upgrade

gmbellew

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Location
Kansas city
First Name
glen
Truck Year
1990
Truck Model
suburban 1500
Engine Size
350
I finally got around to upgrading the headlights on the 1990 suburban. I had previously added relays when I was using sealed beams, and that definitely made an improvement in down range light.

LMC finally had their upgrade lights in stock that take 9006xs (low beam) and 9005xs (high beam) bulbs. They definitely threw more light than the sealer beams, but I was still not entirely impressed. especially with the low beams.

so I did some research on here and found that others had used 9012 bulbs (same 55w, but 87% more lumens) in place of the 9006xs bulb. I had to trim the headlight bucket at the bottom to make room for the bulb socket because it is a 90deg base vs the straight base of the 9006xs bulb. I used a dremel to cut vertical cuts and then just bent the tab back and forth until it broke off to clear the bulb base.

I will say that the 9012 bulbs REALLY woke up the headlights. I am finally happy with the downrange light. there is a good cutoff and plenty of light. I run some wide angle LED fog lights that are pretty bright. The fogs dont overpower the 9012 bulbs and it is pretty impressive.

Anybody looking to make the upgrade won't be dissapointed for a total investment of about $250.

I did try to smash a 9005 bulb in to the high beam, but just trimming the bucket wasn't enough. I was going to have to also cut into the core support and didn't feel like doing that as the 9005xs bulbs are plenty adequate.

just thought I would throw this info out there for others looking for more light.
 

SirRobyn0

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Location
In the woods in Western Washington
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Rob
Truck Year
1984
Truck Model
C20
Engine Size
350
I finally got around to upgrading the headlights on the 1990 suburban. I had previously added relays when I was using sealed beams, and that definitely made an improvement in down range light.

LMC finally had their upgrade lights in stock that take 9006xs (low beam) and 9005xs (high beam) bulbs. They definitely threw more light than the sealer beams, but I was still not entirely impressed. especially with the low beams.

so I did some research on here and found that others had used 9012 bulbs (same 55w, but 87% more lumens) in place of the 9006xs bulb. I had to trim the headlight bucket at the bottom to make room for the bulb socket because it is a 90deg base vs the straight base of the 9006xs bulb. I used a dremel to cut vertical cuts and then just bent the tab back and forth until it broke off to clear the bulb base.

I will say that the 9012 bulbs REALLY woke up the headlights. I am finally happy with the downrange light. there is a good cutoff and plenty of light. I run some wide angle LED fog lights that are pretty bright. The fogs dont overpower the 9012 bulbs and it is pretty impressive.

Anybody looking to make the upgrade won't be dissapointed for a total investment of about $250.

I did try to smash a 9005 bulb in to the high beam, but just trimming the bucket wasn't enough. I was going to have to also cut into the core support and didn't feel like doing that as the 9005xs bulbs are plenty adequate.

just thought I would throw this info out there for others looking for more light.
I'm running the Hella Buckets with the H4 bulb, and also Hella 550 fogs. If your interested in what I did it's in this thread. https://www.gmsquarebody.com/threads/headlight-driving-lights.34990/ And like you found with what you did it was a night and day difference. My truck is also a 2 light system and it sounds like yours is a 4. I have the LMC relay kit, but have not installed it simply because I'm no longer having issues with enough light, but still want to cause of course it's easier on the switches and wiring.

The only reason i went with Hella over LMC was because Hella had the stuff I needed in stock. LMC didn't, I'm guessing they are pretty similar.
 

Big Chip

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Michigan
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Kevin
Truck Year
1979
Truck Model
C35
Engine Size
454
I'm running the Hella Buckets with the H4 bulb, and also Hella 550 fogs. If your interested in what I did it's in this thread. https://www.gmsquarebody.com/threads/headlight-driving-lights.34990/ And like you found with what you did it was a night and day difference. My truck is also a 2 light system and it sounds like yours is a 4. I have the LMC relay kit, but have not installed it simply because I'm no longer having issues with enough light, but still want to cause of course it's easier on the switches and wiring.

The only reason i went with Hella over LMC was because Hella had the stuff I needed in stock. LMC didn't, I'm guessing they are pretty similar.
I upgraded to the Hellas and relays a few years ago and can confirm it's the way to go!
 

timbritton

Junior Member
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Oct 22, 2021
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Location
canada
First Name
Tim
Truck Year
82
Truck Model
1500sierra
Engine Size
427
I put in relays one for each bulb with new 14 ga wire supplied from the battery of course fused so Full voltage is supplied. What a difference lights are bright no more flashlight going down the road.
 

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