They work well - IMO at least. I prefer them up high, my experience has been anything hanging down below the bumper is asking to get smashed......................
Here's another idea to toss into the ring - I've done this on my truck. For tail/turn lights I'm using the 4" rubber mount "Truk-Lite" style, they also make a 4" white light which is fairly bright and doesn't draw a whole lot of juice. I have two of these hooked to my transmission back-up light switch, and the majority of the time I find them bright enough.
If I need more light, a switch on the dash turns on the two utility lights up on the headache rack.
I've been using them for over 20 years! I think they work great, and fairly inexpensive too. I wire mine on a seperate switch so I can see in the mirror how things are going.
I've mounted mine in various locations through the years. I've made them portable so they'd drop in a bed pocket and plug in to an accessory socket I mounted in the bed, on the step bumper, under the step bumper, (don't recommend this one), and my favorite was in the 8" drop step bumper. I hole sawed 2 four inch holes in the wide portion of the drop and mounted one on either side of the hitch. Looked factory installed. There are totally enclosed rubber boots available that these will mount in to keep dirt and salt off the backs of them.
I've also found a halogen replacement bulb for them with a wide dispersion lense that really lights things up. The number is 4466, I usually have to special order them.
I bought some "Baja" lights from auto zone, which as basically rectangle lights, with all the wiring, and covers for the lights. I mounted them under the bumper. When i mounted them, i made them tight enought no stay in one position, but not tight where they don't move if i hit something. I put them on in November, and they're working really well.
Next truck, i think i'd mount them to the hitch, i see a lot of people doing that now with the tractor lights.
Alan puts them on the rear corners of the truck beds and on the homemade headache racks. I like that idea a lot.
On pickups I mon't them to headache racks and to the receiver hitches. On the dump I have them on the hitch plate and on the cab guard. I also mon't some (switch seperatly) to my spreaders to illuminate both in the hopper and near the chute.
AW DIRECT sells a hella light with two 55 watt bulbs in one light can be wired to turn on one or both bulbs. this light on a headace rack will make daylight any where you aim it. not cheap, but then any thing that works is'nt cheap.
Good point about saving the battery. I like to have indiscator lights by my switches. I also wire all lights with relays through the ignition. This was no matter what the lights are off when the key is off.
I mounted one on the bottom of my bumper on my chevy right up agianst the hitch so even if I back into a snow bank it won't get ripped off or anything because it's agianst the hitch, I havn't had any problems, works great.
I have installed both on my trucks with the ability to turn off the lights mounted higher. This is very helpful when it is snowing very hard because the lights mounted high on a rack or bar just reflect off the snow and don't do as good a job allowing you to see. I have mounted the "low' lights recessed behind the bumper on each side of the receiver hitch and wired into the back-up lights so they can not be broken and shine low during heavy snows.
Looks good to me. With the way you have the lights positioned, it will give you a better view of sides your truck will be backing up through. However since you mounted it under the bumper, I suggest you to have a spare light on hand. Image if you get alot of snow, running out of room, and you have to back up in a tight driveway, you probably would end up smashing the lights into frozen pile of snow. Maybe build a rigid light guard? Probably still would get smashed anyway. Otherwise be careful not to smash the lights.
I have my lights the same place. Surprisingly often the sealed beam will just pop out of the rubber mount and not break. I have had this happen a few times and the lights still work. Having lights down low does have the advantage of little glare.