Robust cone light, manufactured from a tough single piece polyethylene body. Tough, high impact polycarbonate uni-directional lens is designed for maximum light output and incorporates a retro-reflective ring. On/off switch located internally, which is automatically activated when placed on to a cone and de-activated on removal from the cone. Over 100 lamps may be placed in line, spacing min 2.2M max 10M. Deploy in any order of sequence. Meets DFT specification for use on motorways and trunk roads on leading tapers.