Effectively Attracts: our bug zapper light bulb includes a wavelength of 365nm black light tube and a 280-480nm white light tube, with wider wavelength range, white tube emit blue violet light, can effectively attract all kinds of mosquitoes; Ultraviolet light emitted by the black tube is effective in attracting flies, moths and other various types of flying bugs Durability and Quality: glass fluorescent mosquito light bulb, not only can be produces 80% UVA energy more than plastic LED tube, also can prevent bulbs burnt out in short time, bug zapper light lasts a long time with constant use, do not need to be replaced frequently Safe to Use: bug bulb attract all kinds of flying insects by emitting light, don't use any harmful chemical or emit or harmful pollutant; Therefore, it will not cause pollution to the human or environment, bug zapper replacement bulbs also can be applied as a night light, the blue purple light emitted by the white tube will not damage the eyesight Easy to Install: bug zapper replacement bulbs are easy to use and install, before installation, disconnect the power supply of the indoor bug zapper and open the grid, simply plug bug zapper light in and tighten, convenient to use both indoors and outdoors Widely Compatibility: 10W T8 bug zapper bulb is a nice replacement, fits perfectly in most 20W electronic bug zapper Color: Black & White Material: Glass Slight color difference does not affect the use Package Contents: 4 x Bug Zapper Light Bulbs Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.