I mounted one of these to the front of a bicycle as a headlight.Pros:* Extremely bright for a bicycle light* Flexible input voltage - I'm running one from an 18v lithium power tool battery with no issues* Durable - My first attempt at mounting this wasn't good, and it fell off onto asphalt while biking at probably 20 mph. The case and lens got a couple dings, but the light still works fine. Also, being mounted directly to a road bike's frame means this gets some pretty good bumps, and so far no problems.Cons:* Not as focused as I'd expect for a "spot" light. Still OK (but not ideal) as a bicycle headlight.* Not actually 27 watts. This is the main reason I'm deducting a star. At 18V, I think these draw something like 21W or 22W. I just slapped one on a (12V) car battery and it pulled almost 23W. This makes me skeptical of the rated lumen output as well. For my use case, one of these is still plenty bright and reduced power draw on a battery is actually good. But claiming these are 27W just isn't accurate.Grate quality supper easy to install only down side is that thwy covers come off and when trying to get s replacement it’s a hassle ?Ofcourse they were easy to install no manual needed. Just make sure you buy the wiring kit separately fromvthe same company and you good to go. They fit nicely on my 2007 accord.I mounted these on my boat, shining down into the water for night fishing. They do the job, and are very bright. I mounted one on the bow, it’s nice because you can flip it up and use it as a navigation light as well.Very nice looking lights and seem heavy duty. They are nice and bright and and really light up the ditches which is where I have the aimed for deer.Just hooked these 9 led 27W pair to replace the lights on our ezgo golf cart. (note: not the factory body mount lights, rather the under front body front lights) These were super simple to install. The new install mounts are heavy duty compared to the original mounts, We used the same holes as the old factory lights but did drill them out a bit bigger as the new bolts where tight. The wiring was east to hookup, red to red and black to black so our lights come on when the headlight switch is turned on and no need for extra wiring. Be warned how bright these are, VERY VERY BRIGHT! We set in our golf cart for several minutes with theses new lights on and said wow so many times before we even started driving. Example, our old lights had that dull white or yellow-ish light that went 15 ft at best in front of the cart. These Nilight's light up upwards of 100 ft of extremely bright light in front and covering the street from side to side. Our golf cart is all battery powered and we did not notice any loss of zoom zoom, Incredible upgrade, would recommend, enjoy.I am upping the number of stars from 2 to 4 because the company contacted me and is sending me a replacement light. I really appreciate this seller's willingness to accept responsibility for their product and solve this issue for me. I went up 2 stars for great customer service and I am also assuming the bad light was a fluke. If I have any other problems I will update this review. As for now my feelings have changed for the good regarding this product.I bought 4 of these lights because one, out of the first pair, I received did not work. I needed 2 for the front of my jeep, so at this time I have one that won't work and one extra, as I had to order another pair. I do realize that they are very inexpensive but if they will hold up for a year or two I will consider it a good purchase. As for now I am not real happy. I will update if my feelings about this product change.Pro's;they seem well made. Heavy plastic, thick acrylic lens etc., but as others note, bracket seems flimsy.Nice crisp light.Good value for low price paid,...so far. We'll check back if things don't last.Con's;pigtails are short. It's always better to have wire leads a bit too long than too short. But it saves money I guess.On power-up, the light seemed a bit too blue for our taste. We have one car with jdm leds and another with genssi's. Both seem very white. These, not so much. However, in the mix with the others, not that big an issue.Would I buy again?If looking for "round" led's of this kind and at such a reasonable price - yes. But it all depends on how long they last. We've bought a lot of led's for two cars and an rv. Our luck with led's has been poor. But we keep coming back because we like the light they make.Llego todo completo y sin detalles en tiempo y forma, las lamparas se ven de buena calidad, las pedi tipo spot y se instalaron en el lugar que ocupaban las antiniebla de mi camioneta durango, la iluminacion es bastante buena, de hecho demasiada, el problema y la razón por la cual solo le di 3 estrellas es que no son spot como las habia pedido sino que son totalmente flood la luz se dispersa para todos lados, llendo en una calle de un solo carril se illumina desde el suelo hasta la copa de los arboles de mediana altura y las casas de ambos lados de la calle, asi que solo pueden ser usados en offroad o en calles de un solo sentido o dejaras a los conductores que vienen de frente totalmente cegadosExcelentes por el precio, contienen lo necesario para instalarse, no se calientan nada al estar encendidas, pero no da efecto Spot o largo alcance, mas bien es de tipo Flood o luces cortas, tiene un haz de luz mas amplio a corta distancia, lo cual es ideal para luces auxiliares, pero para largo alcance no funcionan realmente. desconozco si las versiones Flood den mayor luz a corto alcance incluso que estas, pero aun asi no decepcionan.PROS:Sin duda el precio.Tienen excelente iluminacion a corta distancia, perfectas para luces auxiliares, luz baja o de corto alcance.una vez atornilladas son faciles de dirigir sin aflojar los tornillos de la base, a diferencia de las rectangulares que hay que aflojar para ubicarlas y ajustar nuevamente.CONTRAS:En realidad no son tan Spot o largo alcance, ya que el haz de luz es amplio a corto alcance y no llega muy lejos.La luz que emiten es en un tono blanco frio azulado, perfecto para offroad, zonas boscosas, con mucha vegetacion y piso seco, pero especificamente en carreteras de asfalto oscuro o piso mojado puede llegar a perderse la luz.Los faros de led llegaron a tiempo en buen estado, he comprado muchas veces de esta marca y nunca he tenido ningún tipo de problemas, ademas que la calidad de la luz es bastante buena y fuerte y el tono del color es muy blanco, ideal para los caminos con poca visibilidad.Great product.Though not exactly spot beam,its a mix of spot and flood rather,but they are really bright.But it's best for the money I paid.This is my third Nilight purchase and I am thoroughly satisfied.Though the packaging of Nilight could have been better,along with better quality wires.un faro se daño lo dos estaban juntos a la misma conexcion pero uno empezo a parpadear y se dejo de encender solo el led del centro se quedo encendido bajo ni modo tuve que modificar la pocicion de faros pues solo me quede con uno los dos prendian bien , ya ni modo.