Nightstick USB-557
The Nightstick USB-557 is a round-body LED handheld light rated at 1,700 lumens and 1,390 candela, with White and UV output. That candela figure works out to an effective positive identification distance of 12 yards and visual impairment out to 1 yards, both calculated from the published beam data. It runs on Rechargeable Li-Ion. It weighs 4.2 oz in a body 4.72 inches long. An integrated green laser is fitted. Measured against the 362 handheld lights in the index, it lands about in the middle for output (1,700 lumens), among the least intense 10 percent for beam intensity (1,390 candela), on the lighter side for weight (4.2 oz), and on the cheaper side for price ($90). It is one of 127 entries in the index that qualify as a light in the same 1,000 to 1,999 lumen class. The closest listed comparison is Nightstick NSR-9924XL, the same brand's light in the same 1,000 to 1,999 lumen class, priced at $90.
| Series | USB-557 |
| Light Color | White+UV |
| Emitter Type | LED |
| Lumens | 1700 |
| Candela | 1390 |
| Effective PID Distance (yds) | 12 |
| Max Effective PID Distance (yds) | Under 20 |
| Effective Visual Impairment (yds) | 1 |
| Max Effective Visual Impairment (yds) | Under 5 |
| Battery | Rechargeable Li-Ion |
| Rechargeable | Yes |
| Weight (oz) | 4.2 |
| Length (in) | 4.72 |
| Average Price | $90 |
| Form Factor | Round |
| Laser | Green |
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