Light output :540 lm
Color temperature :2700/4300/6000 K
Working distance :2.5–6.0″ (64–152 mm)
Spot diameter :1.5″ at 3″ working distance (38 mm at 76 mm)
Spot illumination :7900 fc at 3″ working distance (85,000 lx at 76 mm)
Inside diameter :2.45″
Mounting diameter :3.05″
Outside diameter :3.74″


RL16 Mechanical Drawing

Model RL16 :: Compact high-intensity ring light


  • 16 high-power LED lamps
  • Sealed body, IP65 rating
  • Low cost
  • Compact size
  • Brightness control
  • Dark field illuminator and polarizer (optional)
  • CE compliant

Controlled light output

Orled's RL16 is perfectly suited for viewing subjects under high magnification without eye strain. The light from 16 high-output LEDs is refracted through an innovative optical system to provide 85,000 lux at a working distance of three inches. Fresnel optics distribute light evenly around the diameter so that reflected points of light are not apparent when viewing shiny surfaces—nearly the brightness of direct sunlight. Light is very evenly distributed around the diameter so that reflected points of light are not apparent when viewing shiny surfaces.


The RL16 accommodates mounting diameters between 2.1 and 3.0 inches for compatibility with a wide variety of microscopes and other optical systems. Soft point set screws hold the ring light securely to the microscope without causing damage. For custom mounting solutions, three #4-40 threaded holes are also provided on the top side of the ring light.

Sealed body

The outside lens of the RL16 keeps the LEDs and electronics safe from splattering fluids, corrosive fumes, and damaging dust particles. The body is sealed to an IP65 rating. Custom sealing features may be added for use in particularly hazardous environments. The 62-mm threads at the end of the body may be used to mount a camera lens filter for protection of the microscope objective.

Intelligent thermal design

The LEDs used in the RL16 are different from the traditional 5-mm bullet-shaped LEDs which are used in other ring lights. Ours provide a direct heat path from the light-outputting die to the circuit board; this allows the heat to be radiated off through the ring light. This is important because the temperature of the die determines the reliability and longevity of the LED. The claim made by some manufacturers that 5-mm LEDs will last 100,000 hours is not based on real-world applications. Please contact Orled for accurate longevity statistics for the LEDs that we use.

Compact driver

The RL16 is connected to a brightness control unit that fits in the palm of your hand. A convenient thumbwheel adjusts the regulated power, allowing for smooth transitioning between no output and full output. This control unit is in turn connected to an AC adaptor, which can plug into a wall fixture to accept standard line voltages—100 to 260 VAC at 45 to 60 Hz. Plug adaptors for European or Asian electrical outlets are included on request.

Optional accessories

Polarizer—The RL16 can be supplied with a polarizer film and analyzer filter. This feature reduces glare from shiny surfaces and allows inspection of details and defects that would otherwise be concealed by reflected light.

Dark field adaptor—Remove the RL16 from the microscope, install Orled's dark field adaptor, and place it under your subject facing up. The light refracted through the adaptor will light up the subject from underneath without entering the microscope objective. The viewer will see a subject with illuminated edges on a black background. This is an excellent way to inspect edge detail, and the best way to examine defects within transparent objects.


Model Description Price Order Qty.
1 2–9
Ring Lights
RL16-2700 Model RL16 (2700 K) $459 $418
RL16-4300 Model RL16 (4300 K) $459 $418
RL16-6000 Model RL16 (6000 K) $459 $418
POL-RL16 Polarizing filter $36 $36
DFA-RL16 Dark field adapter $33 $33