Uniform Light Sources

Uniformity measurements indicate an imaging system’s tendency to become darker away from the center of the image. This is due to the radial nature of the lens which collects more light in the center. It can be particularly strong with wide angle lenses. Testing for uniformity requires a flat-field test, or uniform light source. In order to minimize cosine falloff in imaging systems with wider field of view lenses, it is important to have a light source that produces uniform illumination across the entire field of view. We also provide uniform reflectance targets for use with external light sources.

Uniform light sources < 180°

Imatest LED Light Panel

Imatest LED Lightbox

RS-9 Tunable LED

Basic Information

The Imatest LED Light Panel is a versatile and low-profile uniform light source easily integrated with Imatest hardware and charts. It includes universal mounting points and wireless light controls. It is offered with a variety of color temperatures as well as near-infrared.

It is ideal for testing all image quality factors.

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The Imatest LED Lightbox is a highly uniform light source with 95% uniformity, designed for dynamic range and ultra-high resolution testing. Choose from a continuous range of light levels between 30 to 10,000 lux.

The Imatest LED Lightbox is our most popular uniform light source.

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The Gamma Scientific SpecralLED provides unprecedented Resolution and Accuracy – 32 Discrete LED Wavelengths Covering Visible and NIR lighting.

Built in integrating sphere for extreme uniformity.

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Uniformity

90%

95% (90% for NIR options)

Luminous Uniformity ≥95% for 65mm at center and tapers off towards edges
Chromatic uniformity: Δu’v’ Max ≤ 3 points in 65mm spot in center and tapers off)

Color Temperatures & Illuminants

Single Channel:
3100K
4100K
5100K
6500K
NIR 850nm
NIR 940nm

Multi (Dual) Channel:
3100K & 6500K
NIR 850nm & NIR 940nm
One Visible & One NIR

Powerful Synthesis Engine – Simulate any CIE Illuminant or Macbeth™ / X-RITE™ Color Patch
1,900K – 40,000K

Intensity

100 to 1,000 lux

NIR = 2 to 20 W/m²

30 ~ 10,000 lux

NIR = 2 to 20 W/m²

30 to 109,900 lux (spectrum dependent)

Diffuser Panel Active Area

A: 229 x 152mm (9×6″)
B: 260 x 220mm (10.2×8.6″)
C: 432 x 305mm (17×12″)
D: 610 x 432mm (24×17″)
E: 907 x 540mm (35.7×21.3″)
F: 907 x 680mm (35.7×26.8″)
G: 1225 x 680mm (48.2×26.8″)

B: 260 x 220mm (10.2×8.6″)
C: 432 x 305mm (17×12″)

Contact sales@imatest.com.

75mm (3″) Dia. Viewing port
Ultra wide 180° FoV option

System Dimensions W x H x D

A: 299 x 222 x 40mm (11.77×8.74×1.57″)
B: 384 x 334 x 60mm (15.12×13.15×2.36″)
C: 512 x 385 x 60mm (20.16×15.16×2.36″)
D: 690 x 512 x 60mm (27.17×24.4×2.36″)
E: 987 x 620 x 70mm (38.9×24.4×2.8″)
F: 987 x 720 x 70mm (38.9×29.9×2.8″)
G: 1305 x 760 x 70mm (51.4×29.9×2.8″)

B: 400 x 380 x 200mm (15.7x15x7.9″)
C: 600 x 490 x 200mm (23.6×19.3×7.9″)

460 x 405 x 305mm (18.1×15.8×12″)

Controls

Manual, USB or Wireless (WiFi) Controls

Proprietary software control: Contains Full Spectral Calibration and Handles Spectral Fitting, Preset Storage, and Real-time Optical Feedback

Ultra-Wide Uniform light sources >180°

230° Hemispherical Uniform Lighting System

RS-9-6 180° Tunable LED

Basic Information

The LB3 spherical light source for testing up to 230 deg FoV camera systems. For testing Lens Shading, Color Shading, AE, Blemishes, OTP, etc.

Diameter 200mm or 500mm, opening aperture 90mm or 250mm.
Visible adjustable color temperature range: 2300-6500K.
Optional IR range: 850nm + 940nm.
Optional camera holder.

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The SpectralLED® Wide Field of View (FOV) is ideally suited for applications requiring a field of view up to 180°. The unique optical design delivers equal radiance over the entire field, which is critical for users desiring flat fielding fisheye or ultra-wide FOV lens designs. With better than 95% uniformity across the 75mm output, the performance is unmatched in the industry.

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