Who makes the best H4 bulb? - Toyota Nation Forum : Toyota Car and Truck Forums

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post #1 of 11 Old 01-02-2017, 01:46 PM Thread Starter
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Who makes the best H4 bulb?

I just put the Hella conversion kit on my 93 toyota and used the H4 bulbs that came with the kit. I was curious if anyone makes a better brighter H4 bulb. Let me know. Thanks!
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post #2 of 11 Old 01-02-2017, 03:04 PM
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Well first off you should measure the voltage drop to the bulb, just reducing that drop can brighten the standard bulbs dramatically. 12g wire with relays and ceramic sockets will allow you to reduce voltage drop from the stock wiring to almost nothing, feeding full voltage, which can increase light output to almost 30% over stock wiring. With heavier wire and ceramic sockets you can safely run higher wattage H4 bulbs if you feel the need.
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post #3 of 11 Old 01-10-2017, 05:12 PM Thread Starter
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Is that why people get the wiring harness when they get the Hella kit?
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post #4 of 11 Old 01-10-2017, 08:28 PM
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Well when changing from sealed beam to H4 you need a jumper to swap the pins or you need to repin the vehicle harness, if that's what you're talking about? The Hella kit comes with the jumper harness, not a full relay harness to run battery power to the headlights at full system voltage.
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post #5 of 11 Old 01-10-2017, 10:12 PM Thread Starter
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When I installed my Hella kit the stock plugs on the truck plugged right into the bulbs. There wasn't any harness or anything at all.
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post #6 of 11 Old 01-10-2017, 10:17 PM
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In place of sealed beams? Odd but ok, the sealed beams have two pins swapped from what the H4 has but physically they plug in.
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post #7 of 11 Old 01-10-2017, 10:24 PM Thread Starter
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Ya I had sealed beams before. And whatever H4 bulbs they sent with my Hella kit plugged right into my stock plugs on my 93 Toyota pickup. There were 3 prongs on the bulb also.
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post #8 of 11 Old 01-10-2017, 10:50 PM
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Yes, but electrically two of the terminals are swapped despite the same physical configuration.

Maybe not in your application? Anyway, not the same as running a harness with heavier wiring and relays to draw power right off the battery to avoid voltage drops.
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post #9 of 11 Old 01-10-2017, 11:10 PM
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Looks like you lucked out, same electrical and physical pin out as H4.
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post #10 of 11 Old 02-25-2017, 08:53 AM
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Does someone make a kit for this? Sounds like a good, cheap upgrade

No situation is so bad that it can't get worse
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post #11 of 11 Old 02-25-2017, 10:16 AM
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Hella sells the lamps with bulbs and bulb covers (Rubber caps). I guess it's a 'kit'. Some places also make heavier relayed wiring harnesses for head lights, but almost all of them are junk compared to building your own which really isn't very hard to do and totally worth the effort and expense. Doing both nets a HUGE boost in light output with a higher color temp for 'whiter' less dingy yellow light.
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