The fact that scorpions are strongly fluorescent when illuminated with long ultraviolet light (320-400 nm) has been known for decades (LAWRENCE 1954). Scorpions (and their exuviae) that do not fluoresce under UV have are yet to be found, although first instar nymphs are not generally visibly fluorescent. The fluorescence exhibited by scorpions and the intensity range of the light emitted by them may vary among species, and is affected by the time elapsed since the last molt (STAHNKE 1972). The UV light generally does not noticeably affect the behavior of scorpions (WILLIAMS 1968;STAHNKE 1972). Molecules associated with the cuticular fluorescence of scorpions have been identified as the beta-carboline (STACHEL et al. 1999) and 4-methyl, 7-hydroxycoumarin (FROST et al. 2001). However, the biological function of fluorescence has not been definitively demonstrated (KLOOCK et al. 2010). Some specialists have hypothesized that fluorescence has no function. For them, fluorescence, is either a relict trait (Frost et al. 2001) or is correlated with some other aspect of the functional molecules responsible for it (STACHEL et al. 1999). In experiments, scorpions continuously exposed to UV light for several weeks showed significant reduction in cuticular fluorescence (KLOOCK 2009). UV light can be also used to study the external morphology of a scorpion's epicuticle (VOLSCHENK 2005).Distinct invertebrate taxa, such as spiders (ANDREWS et al. 2007), harvestmen (ACOSTA 1983) In the field of pest control, the use of UV lamps is widely recommended to collect scorpions and also for locating rodent urine. In the past, mobile fluorescent lamps were used to collect scorpions (WILLIAMS 1968, STAHNKE 1972 and, more recently, low power LEDs (LOWE et al. 2003) have been used. Those, however, in order to be efficiently employed in the field, require a configuration with many LEDs -168 in the device described by LOWE et al. (2003). Our goal in this paper is to present a new device based on high power UV and white light LEDs, which can be interchanged. This new, versatile, and low cost device has long battery life. Even though it is optimized to detect and collect scorpions in low light situations, it can also be used with other groups of organisms.The device (Figs 1 and 2) employs, as illumination sources, two 3 W UV LEDs (model EDEV-SLC1-R, light emission 395 nm-410 nm ± 0.5 nm at 25°C), and two 3 W "white light" LEDs (model EDEW-3LS5-FR, light emission 455-470 nm ± 0.5 nm at 25°C), manufactured by Opto Edison ® . We used collimator lenses with an aperture angle of 25°, model LL1ED-CV25-L-M1, manufactured by Led Link ® . We chose not to apply a current exceeding 500 mA on the LEDs (below the nominal current of 750 mA), in order to prolong the lifespan of both the LEDs and the battery. As a further measure to increase the lifetime of the LEDs, the voltage on them is increased from 0 V to 7 V (3.5 V to each LED) by applying a tension ramp through pulse width modula-