Frequently Asked Questions (FAQ’s) | PestWest Blue CSI Kit

PestWest answers questions about your CSI Blue Light Kit used for fluorescent pest inspections.

Blue light works in much the same way that ultraviolet light does.
White light

Blue light makes material emit fluorescence (evidence glows), absorption (evidence darkens), and oblique lighting (small particle evidence revealed). Instead of using wavelengths of invisible ultraviolet radiation, visible blue wavelengths are used.

To assist you during your detailed inspection to enhance, detect, isolate, and spatially document pest evidence and activity for appropriate elimination techniques.

Fluorescence with glasses

Your CSI Kit emits light at a wavelength of approximately 455nm (blue region). This light excitation source causes certain materials to give off weak fluorescence. When used in a darkened room, only the light emitted by the CSI Kit is present.

ParticlesThis light frequency causes some materials to fluoresce, darken, or particulate, but this fluorescence is hidden or masked by the intense blue light.

Finger printsFor this reason, you wear orange barrier filter glasses between your eyes and the objects being examined. This filtration effectively blocks the blue light permitting viewing of the weaker fluorescence.


Yes. When you illuminate a surface with intense blue light, much of that light can be reflected back to your eyes.


If you do not block it from reaching your eyes, it will degrade or destroy the contrast between the indication and the background that you need for good inspection performance.


Yes. The orange glasses are carefully selected to work with the blue light lamp.

Bed Bug specimen life cycle

If you use just any orange glasses (shooting glasses, Blue-Blockers, etc.) it is possible that you will have either reduced fluorescence intensity or reduced contrast.

To avoid this, use only the filter glasses supplied by your CSI Kit.

Blue light sources provide the best results when used under subdued lighting conditions. Total darkness is not necessary to see the fluorescence produced from most items of evidentiary or specimen value. Wear the orange contrast glasses and allow your eyes to adjust to the light (this may take a few minutes including adjusting to the blue light).

Bed bug eggs

Take your time, while holding the blue light lamp 12 to 18 inches above the inspected surface, move methodically from left to right, up and down, or vice versa, but do not skip around. Gather samples with your CSI Kit forceps and container-magnifiers, document your findings, and then determine the appropriate elimination techniques.

Scorpion flourescing

Yes. Blue light wavelengths are at reduced risk unless you stare directly into the light without the filter glasses on.

Visible spectrum

The blue light is very intense and it would cause an afterglow if you looked right into it. Do not look directly into the light beam as this may cause injury to your eyes.

Yes. Replacement kit components are available if needed. Contact your favorite distributor or PestWest for additional information.

Yes. PestWest offers marketing aides and technical documents to help you market your business.

Go on to www.pestwest.com/bedbugs for additional information.

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