Review on 💡 Dimmable LED Recessed Replacement for Industrial Electrical by Parmida by Gary Duncan

Quick Note: Not Sure! The leads from the PCB and the ground wire are on the side of the LED PCB and pass through a hole in the metal base. It is not as shown in Revain Add. These wires are actually outside the "4" (3.56") octagonal box and therefore get caught under the sharp edge of the metal octagonal box, which can cause a short and a fire hazard. Other reviews have shown photos of shorts, but not the reason! This placement problem will be even more severe for the smaller octagonal block. I've also tried a larger square box and while the wires only run at the corner of these boxes, the corner of the box then rests on a slot, in which the lens cap should snap into place. So you can't force the lens cap to stay in place. The display shows wires coming out through the center of the circuit board and the metal body of the lamp. This could be a lot better as the wires then move would be in the octagon box. If only that came! The price is great so I was going to buy a pack of 24 bulbs but then i thought i should try one. I bought 4 packs. I tested each by plugging them into a power source prior to installation. They all worked and looked pretty bright. So I decided to see if I could change the light to make it work with a 4 inch octagonal box. I can, but I'm also an electrical engineer. In doing so, I also found that the LED circuit board had thermal grease between the circuit board and the metal body of the lamp. This is not surprising as it is used to transfer heat from the LEDs to the metal case. However, this mass must be applied very thinly and evenly for it to work. All of this was applied to a corner of the PCB leaving at least 2/3 of the board unconnected. Since the lifespan of LEDs is highly dependent on how hot they get, this likely means that this bulb won't last as long as you think it will. So I need to assemble everything and apply the right thermal paste for the board.! I then have to re-do/re-route the wires to make them secure and failsafe. I've looked at other reviews and pictures and you can see the design has changed over time. The lights sent to me (purchased 20th January 2019) have a square LED board with two notches through which mounting screws pass for attachment to an octagonal box. The LED chips are a bit more scattered on this board than on some of the previous test images. Therefore, the light is spread over a slightly larger area. I intend to attach them to standard 4" (actually 3.58" wide) octagonal metal boxes and then screw the boxes to my basement ceiling. Octagonal boxes are most often square with rounded corners to give them the shape of an octagon, but the rounded corner sides are the same length as the straight sides. The screw holes match but are slightly less than ideal, allowing the two screws to fit together snugly. There are three sets of increasing diameter screw holes for attaching the octagon box. The 4 inch box uses a medium set of screw holes. By rerouting the power cords through the small mounting holes in the octagonal box, I was able to insert the wires into the octagonal box. However, rubber grommets are required to prevent the metal edges of the holes from cutting the wires. How much time and effort are you willing to put into a cheap product to make it safe and actually work!?! I'll spend a few more hours fixing these 4 but I won't be buying more!