What a hot spot is and where it shows
A hot spot is a small area reading much brighter than its surroundings. On a wall it appears where the center of a beam lands and nothing spreads it out. Inside a cove it appears where the tape sits closer to the return than elsewhere, because surface brightness drops quickly as that gap grows.
Hot spots are a distance problem more often than an output problem. As a planning start, a setback of roughly a third to a half of the height being washed tends to even out: a 9 ft wall lit from 3 to 4 ft out reads far more evenly than the same wall lit from 6 inches, and turning the strip down does not fix the difference. Test those ranges with a lit sample in the room rather than treating them as published figures.
What an even wash is and what it costs
An even wash is a field of light with no visible pattern in it. No arcs, no bright center, no dark scoops. It reads as a lit surface rather than a lit fixture, which suits flat drywall and ruins split-face stone.
It costs three things. Depth, since the setback that evens the pattern eats ceiling or soffit space you may not have. Contrast, because the flat light that hides scalloping also hides the relief in stone, brick and troweled plaster. And output, because light spread across a wider area arrives dimmer at any one point, so a wash generally calls for more lumens per foot than a graze over the same length.
Dot visibility inside the channel is a different problem
Scallops and hot spots are patterns on the lit surface. Dots are a pattern on the fixture itself, visible when you look straight at the emitting face.
An aluminum channel with a diffuser lens reduces but does not guarantee the removal of visible dots. Diffuser type, channel or profile depth and LED density weigh just as heavily on how dots read. Plenty of runs work without one. It does help dissipate heat, which LEDs and drivers produce in normal operation. A dense COB tape such as the LEDClub 24V COB 500 Series at high output presents a continuous emitting line rather than separate points, though its published density, lumens per foot and watts per foot still need checking. Our piece on what makes a run read as dotless goes further.
How to choose among scallops, hot spots and even washes
Match the effect to what the surface deserves. A wash suits flat drywall, a painted cove return, or anything meant to read as a plane. A shallow graze that scallops slightly suits split-face stone or brick, where the arcs and the shadow reinforce the material. A hot spot is almost never wanted across a broad surface, though a deliberate bright patch behind one object is different.
Then specify around that choice. Beam spread, setback and density interact, which is why what beam angle does to the spread is worth reading first, and why the strip options listed by output level compare more easily once the pattern is settled. Every device in the low-voltage path carries the same rating as the tape, so a 24V strip means a 24V supply and, where a controller sits between them, a 24V controller. Confirm dimming against what each maker publishes for those exact devices rather than inferring it from the word dimmable. Hardwired drivers, junction boxes, in-wall cable and any switch or dimmer plate are for a licensed electrician, worked to local electrical code, to the NEC where it applies, and to whatever the manufacturer instructions require, with the breaker off and the circuit confirmed dead before anything is opened, and low-voltage guidance authorizes none of it.
