Dodgie, misleading or.....?

[City Farmer]

Sounds a little fishy to me. I'm sure there bright but I don't think there is any way they can be using "3" watt LEDs. LEDs have a minimum forward voltage (Vf) that has to be met before they even turn on. They are over driving the LEDs at 24 volts if they work with 12. I bet there only 1 watt being over driven. The highest most efficient (3) watt LEDs on the market have a Vf of 3.1V @ 1500ma. So it would take 27 volts at a minimum to even turn them on. Current is what determines how bright/dim they are.

 

[weedpharma]

There appears to be a current control circuit. It is probable that they are in series parallel strings with electronics to to control the current.

Weedpharma

 

[crazyal]

What's the maximum rated voltage for the lights? That's what will determine their "wattage". Just because your tractor or car is not 24v doesn't mean the lights aren't 27w.

 

[weedpharma]

To me, the power rating should be voltage x current draw. 12v x 1.25A is nowhere near 27W. The current drops as the voltage is raised. I cannot recall the actual figure but recall it was consistant with being around 15W.

Weedpharma