SkeeterVac bite-guard Ultraviolet Bulbs for use with SVE600 & SVE6211 (2 pack). SkeeterVac bite-guard? ultraviolet replacement bulbs by Blue Rhino are designed for the SkeeterVac bite-guard SVE6211. Ultraviolet light is a proven method for attacting a broader range of insect species.Two bulbs are included for season long operation. One year limited warranty included.