This publication
http://www.acfs.go.th/standard/download/eng/american_foulbrood.pdf

>
Suggests exposure between 310 to 400 nm

"3.2 SCREENING TEST OR RAPID TEST
3.2.1 Pathological method (Clinical test)
The principle of this test is to observe any clinical symptoms from bee
cell. If bee larvae or pupae are infected with AFB, the larval or pupal
color changes to creamy brown and then to a dark brown. The diseased brood
eventually dries out to form characteristic brittle scales that adhere
tightly to the lower sides of the cell. Sometimes, the larval remains are
difficult to locate. The infected dead larvae could be conveniently located
by using ultra-violet or near ultra-violet wavelength. Exposure between 310
to 400 nm will cause any infected dead larvae or AFB scale material to
fluoresce. Careful attention shall be made when using this technique as
both honey and pollen will also fluoresce."

Karen T-K

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