Light Emitting Diodes, LEDs, are finding usage in an ever-increasing number of electro-optical applications. Unsurprisingly ultra bright and high power LEDs are also becoming more common in research facilities as their potential for inclusion in free space optical communication systems are investigated. Despite these LEDs often being identified as potential laser replacements, the LEDs are generally considered safe to use and because they are viewed as being harmless no thought is ever given to undertaking a risk assessment. This issue is further compounded by there being a general unawareness that LEDs should be treated in a similar manner to lasers and that LEDs are included in the laser safety standard, BSEN60825.
The actual hazard presented by an LED has recently been well scrutinised due to pubic concern that LEDs were becoming dangerous as brighter variants were developed and industry’s objections that the current laser safety standard heats LEDs too rigorously. These investigations have shown LEDs to be safe if used properly.
However LEDs can still be dangerous if misused, and the potential for misuse is great within the confines of a research facility. A potential method of misuse will be presented along with measurements to demonstrate the hazard. Under such circumstances steps need to be taken to ensure full awareness of the hazards and that adequate safeguards are in place. As an example, methods used at QinetiQ Malvern to control LED misuse are discussed.