Choosing the Right Floodlight
-- COB vs SMD, Mounts, IP Rating
Choosing the Right Floodlight: COB vs SMD, Mounts, IP Rating
Short answer: pick the beam before you pick the price. A floodlight fails a site for two reasons — wrong beam spread or dead electronics — and the second one is what separates a $20 fixture from a $60 fixture. Order your evaluation like this: beam type for the job, then the lumens-per-dollar sanity check, then mounting and ingress protection. Price comes last, because a floodlight that dies in year two costs more than the one that lasted ten.
Why cheap floodlights fail early
Online marketplaces let anyone list a lighting product, and plenty of listings never passed an aging test or a thermal test. The failures we see in returned units are predictable, and they are almost never the LED itself:
- The driver, not the emitters. The electrolytic capacitors in a cheap driver dry out and the fixture quits. LEDs are typically rated for 50,000 hours; the electronics around them often are not rated at all.
- Thermal design that exists on paper. A floodlight is a heat sink with lights on it. Undersized fins or a missing thermal pad cook the junction, and lumen output falls long before the fixture dies — you just stop noticing how dim it got.
- No aging run. In our factory every production batch goes through a burn-in aging run before shipment, because infant mortality shows up in the first hours of operation, not the first year.
The practical consequence: a cheap floodlight that needs replacement within 2–3 years is not a bargain, and on a fixture mounted 30 ft up where the labor is the expensive part, it is a cost trap. Check the certification marks and the warranty period — a manufacturer willing to put five years on paper has usually run the tests that earn it.
The lumens-per-dollar sanity check
Vendors inflate lumen claims, and there is a quick screen for it. Divide the fixture's rated lumen output by its price; if the result exceeds about 500 lumens per dollar, treat the claim as suspect.
Worked example: a 100 W floodlight at a realistic 130 lumens per watt produces about 13,000 lm. At a $20 street price that is 650 lm/$ — above the line, so ask for the LM-79 test report (the IES standard method for measuring total luminous flux of a luminaire) before believing the number. The same fixture claimed honestly and sold at $40 lands at 325 lm/$ and needs no explanation. This check does not prove a fixture is good; it flags the ones worth double-checking.
COB vs SMD: match the beam to the job
| COB (chip on board) | SMD (surface mount device) | |
|---|---|---|
| Beam | Concentrated, tighter spread | Diffuse, wide spread |
| Best for | Spot and accent lighting — flags, facades, signage | Wall washing and broad area coverage |
| Strengths | High light concentration, good efficacy per package | Spread-out sources, easier thermal design, long life |
| Trade-off | Tight beam means more fixtures for area work | Lower punch at distance |
The mapping is simple. Wall washing a building face calls for the wide, diffuse output of SMD arrays. Punching a flag, a sign, or a facade detail calls for the concentrated beam of COB. Parking-lot and yard coverage sits between the two — decide from the target illuminance and uniformity, not the product photo. If you are unsure which type suits the application, a lighting professional or our lighting design tool will settle it in minutes.
Mounting: wall, yoke, knuckle
| Mount | How it attaches | Use it when |
|---|---|---|
| Wall mount | Bolts to a vertical wall through a conduit junction box | Side illumination of building exteriors |
| Yoke | U-shaped bracket, angle adjustable | Aim will change — facades, signage, sports areas |
| Knuckle | Threads onto a pole or pipe (1/2 in NPT is the common catalog size) | Pole-mounted road and parking lot lighting |
Two installation notes that decide whether the fixture stays where you aimed it. First, a wall mount is only as good as the wall — confirm the substrate and anchors can carry the fixture plus wind and ice loads, and use the conduit junction box as the electrical and mechanical anchor, not an afterthought. Second, whichever mount you choose, torque the fasteners and set the aim before the crew leaves; a floodlight that loosens under vibration spends its life aimed at the sky. Knuckle mounts also make lamp changes fast, which matters when the fixture is over a drive lane.
Ratings, color, and controls
- Ingress and impact. For outdoor use check the IP rating — IP66 is the norm for floodlights, the first digit against dust and the second against pressurized water jets. Where vandalism or ball sports are a factor, look for the IK impact rating too (IK08 and up for exposed sites).
- Color temperature. Warm white suits residential areas and leisure spaces; cool white suits industrial yards and parking lots, where perceived brightness and contrast matter more than ambiance.
- Controls. Remote control, scheduling, and dimming are standard on smart floodlights; motion sensing pays for itself on sites that are dark most of the night. Specify the control protocol up front — retrofitting a smart fixture onto a dumb switch wastes the feature.
Buying checklist
Buy through formal channels, read the certification and warranty terms before ordering, and keep the invoice — a floodlight with no proof of purchase and no after-sales channel is a disposable product at a permanent price. Do not use price as the selection criterion on its own; the total cost of ownership runs on replacement labor as much as on fixture price.
What this page does not cover
This page covers floodlight selection in general — beam type, quality screens, mounting, and ratings. It does not cover solar-powered floodlight sizing, which adds an energy-balance calculation to everything above; for off-grid units, start from our lighting coverage tool and the all-in-one solar lighting systems we manufacture, where panel, battery, and driver are matched as one assembly.