How much power do leds pull?

[Bansil]

So I get the math for ac and DC pulls which is common.

How to tell the pull of leds? Looking to put a led headlamp and taillight on minibike, no charge coil. Was going to use a small upc backup battery.

What led info do I need and what is math?

For instance I got these

• Nilight 18w LED Light Bar
• LED Power: 18W (6 x 3W High Intensity LED).
• Beam Pattern: Flood Beam; Lumen: 1260LM. Input Voltage: 9-30V DC (fits 12V, 24V vehicles).
• Working Lifespan: Over 30,000 hours. Working Temperature: -40~85 degrees Celsius. LED Color Temperature: Pure White 6000K-6500K. Material: 6063 Aluminum Alloy Profile, High quality Led Chips, PC Lens.
• Wiring Harness Kit: 12ft Universal Wiring Harness Kit - Two Leads.
• Wire Gauge: 16 AWG; Operating Voltage: 12V DC. Max Wattage: 180W; Max Ampere: 15A.
• Switch:5 pin on-off rocker switch; DC 12V automotive relay, inline blade fuse with three extra fuses.

These are 2 small lamps but it says 18 watts but later says 180 watts so do these pull 1.5 amps or 15 amps?

 

[Functional Artist]

AFAIU if they draw ~1.5A, the math should be (18W/12V = 1.5A)
...& so, it looks like (2) of them (wired in parallel) should draw ~3A

Led's are known for their low current draws
...so, I'd say an LED light that draws ~15A at 12V (~180W) would be/should be pretty huge

 

[ezcome-ezgo]

Yeah, a 15 amp LED is also known as a laser beam.

 

[Bansil]

That is what was confusing me, all of them have conflicting data.

I plan a single 12v led flashing for a faux headlight and a single led in a small red housing to look "legit" at quick glance for 5-0.

Brake light will be powered thru a momentary on switch with my thumb

 

[Bansil]

Disclaimer: to add this is research for riding on my private land...not ripping up the ...cough...cough...byways

 

[Bansil]

Yeah, a 15 amp LED is also known as a laser beam.

Yeah, like an IR headlamp on an M60 tank

 

[Snaker]

So I get the math for ac and DC pulls which is common.

How to tell the pull of leds? Looking to put a led headlamp and taillight on minibike, no charge coil. Was going to use a small upc backup battery.

What led info do I need and what is math?

For instance I got these

• Nilight 18w LED Light Bar
• LED Power: 18W (6 x 3W High Intensity LED).
• Beam Pattern: Flood Beam; Lumen: 1260LM. Input Voltage: 9-30V DC (fits 12V, 24V vehicles).
• Working Lifespan: Over 30,000 hours. Working Temperature: -40~85 degrees Celsius. LED Color Temperature: Pure White 6000K-6500K. Material: 6063 Aluminum Alloy Profile, High quality Led Chips, PC Lens.
• Wiring Harness Kit: 12ft Universal Wiring Harness Kit - Two Leads.
• Wire Gauge: 16 AWG; Operating Voltage: 12V DC. Max Wattage: 180W; Max Ampere: 15A.
• Switch:5 pin on-off rocker switch; DC 12V automotive relay, inline blade fuse with three extra fuses.

These are 2 small lamps but it says 18 watts but later says 180 watts so do these pull 1.5 amps or 15 amps?

Ya got a couple things going on here.
Your example is tricky because it covers a range of voltage and no explanation of when the 18w comes up, at 9v or 30v or anywhere in the range?
LED bulbs themselves take damn near no power, but they are raw components and typically require support circuitry, which varies in power.
LED's will typically get brighter with higher volts and need a ballast resistance to prevent blowing out, the resistance is the power hog.
So is the 18w at your nominal 12v?
Plus a relay is mentioned, is that part of the ratings?

The 180w max wattage is written odd.
I think that it and the 15a mentioned is the total system maximum capacity, not the usual power requirements?

If your just going to use a separate battery, why do you care about the usage?
Just hook it up and you will quickly find out if the battery lasts long enough to be useful.

 

[Master Hack]

The other part of the formula is battery capacity, if there is no charging system.
batterys often have ratings in amp/hours. If you have a battery rated @ 10 amp hours for instance and a load of 3 amps, your battery would provide 3 amps for 3.333333 hours IN THEORY.
the battery would deliver 1 amp for 10 hours or 10 amps for 1 hour. (In a perfect world)
your results may vary. The above is just a rough guideline.

next time you have a bout with insomnia here is a sure cure: https://batteryuniversity.com/