For the fluctuation, yes your battery couldn't load the lamp. Either the battery is faulty or your bulb setup eats so much power. In idle the supply voltage isnt enough. In HID setup they use ballast hence you wont feel a damn.
My recommendation is HID with lumens above 3000+ . mine is only 2200.


). Relay is a mechanical device that relieves the switch from handling high current input to output section. To handle high currents, the switch (bike's pass switch/headlight turn on switch) should be built for that and most of the cases, it will be bulk and will make it a tough fit for switch gears. Then comes the big toll, the extra wiring will increase resistance and hence the power reaching to headlamps will be less always. Also lengthier wire = more resistance = heat generated = wire burns = chances of fire etc. A 100W bulb might eat up to 8-10A of current when compared to 60W which takes ~5A of current. Does the switch handle this double the amount of current flow?. Now to tackle this, they will use a relay to handle the high current switching, and let the switch operate at safe current levels, there by saving the costlier switch gears and other peripherals that connect. Now coming to the 100w bulb, no matter if the relay is added, still the load is a load and you can't relieve battery from that by this. A good relay + wiring setup will help conduct the high current better thereby reducing fire or burns on long run plus you get better output. Without relay, you'd have to pray always that nothing will get burnt and with relay you can relieve from that and your switches will also be fine. A small calc can help understand better.

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