This light box uses light-emitting diodes (LEDs) to produce light. The efficiency of these LEDs is far superior to that of ordinary halogen lamps, as the light-emitting diodes produce only "cold light", with no undesirable thermal radiation.
As a result, the electrical power required to achieve the same luminous intensity is much lower than with halogen lamps. What's more, the small amount of heat produced by the electrical circuits can be dissipated more easily, with limited means of cooling. For these reasons, LED lightboxes are considered a brighter, quieter working tool.
The "white" light color is also perceived by many users as being brighter and more contrasty than that of halogen lamps with the same measured density. This light color does not change, even when the lighting intensity of LED devices is reduced, unlike halogen lamps where there is a pronounced drift towards "yellow". It should also be pointed out that a large number of LEDs are needed to achieve high lighting intensity. The result is a very even light distribution over the inspection surface.
Another advantage of LEDs is their longer life than halogen lamps. LEDs do not need to be replaced in the first few years. However, the 40,000-hour life indicated by LED manufacturers is unlikely to be fully achieved in practice.
The current running costs of LED luminaires are considerably lower than those of halogen luminaires, so the slightly higher investment costs will be quickly recouped.
The longevity of the light source is just one aspect. Energy savings are just as important. Table 1 below gives a good overview. The high power consumption of halogen lamps in "basic lighting" mode should also be taken into account here. See the consumption comparison table overleaf.
Other advantages are that there's no downtime to replace lamps, and the ambient heat created by the light box is considerably reduced. The latter is certainly a big plus for operators.
WilnoLED devices have already been used intensively for over a year in difficult conditions, with multi-shift working days. The light scopes have proved their worth and given full satisfaction. This is particularly true in NDT training centers, where the new devices are ideally integrated into the halogen lamp panel. Their low heat emission spares valuable demonstration films.
WilnoLED devices allow extended film interpretation without the risk of film distortion.
- Light density ca. 130,000 cd/m² useful blackening (optically diffused density) D = 4.1 to EN 25580
- Illuminated surface 8.5 x 22 cm, with 2 additional masks.
- Continuously adjustable intensity from 5 to 100%.
- Adjustable by foot switch or continuous lighting.
- Basic lighting adjustable by foot switch to avoid glare.
- The power supply and foot switch cables are connected to the unit by a plug.
Specifications
- Electrical data: 100-240V at 50-60Hz, 170 W
- Dimensions : W 412, H 210 mm, D 173 mm
- Weight: 6.3 kg net
- Housing: powder-coated
- Patent application filed in 2007
Cost of use
Assumed duty cycle and average operating time.Utilization time with 50% switch-on time (50% full power, 50% basic lighting)
Radiology
