I have been looking a lot to find some good answers. There are some real good forums out there that help make some conversions but they still don't get down to what i call the "brass tacks"
For years we all used and fairlly well understood or could at least relate to "candle power". But today, many aftermarket driving, fog, offroad lights use lumens. Some of the forums I saw have good technical explanations and math formulas to give some comparisons BUT what they still don't tell you how to really compare one light to another. The reason is because candle power is mostly a value that relates to the amount of light that is radiated in all directions as in a sphere or ball. We all know that driving lights focus their illumination in one general direction.
To get closer to making a good comparison you also have to factor in beam width and height to determine how the "candle power" is focused in a given direction. All this is good but when you are trying to compare a halogen/incondecent to an LED really doesn't help much.
So where am I going with all this. I have a pair of aircraft lamps that I obtained many years ago and did USE on a GMC Suburban. They are quite bright. They will make an oncomming driver take a ditch if they refuse to dim their bright lights and you hit them with these. They have some pretty strong drawbacks though. They are 250 watts EACH. That means about a 20 amp draw per bulb. If you have 2, (which I do), that's 40 amps. That means big wire, big load, it isn't too conducive to try to run large enough wire inside the truck and the switch problem is evident. So I built a relay box for them but again the electrical load is huge.
NOW fast forward to today's technology. I can get two LED driving lights that boast 1300 lumens each. The electrical advantages are obvious. They draw less than 2 amps each and the life of the LEDs exceeds the halogens by an enormous amount.
So I said all this to say this. Getting real life comparison is quite difficult. The GE aircraft lights will burn the paint off your car at 100 feet and make a dark road look like daylight but the lifespan of them is relatively short, aircraft bulbs are expensive and I am not sure if my 07 Tacoma will support the load. If the LED lamps will do as well, the choice is a no-brainer.
Comments, input, thoughts?