For best results, use in a dimly lit room against a dark background. This handheld, portable model requires 4 AA batteries. Shortwave lamp This shortwave lamp clearly shows phosphor and phosphor afterglow on GB stamps until 1992. For best results, use a shortwave lamp in a dark room, the darker the room the better. To see the different colored phosphors in the 1960 Wildings issue, it is the phosphor afterglow you are looking for when you turn off the UV light, green phosphor is the brightest (10 seconds afterglow) followed by blue, (15 seconds) Violet has a very short afterglow (5 seconds) It will be difficult to see the afterglow in daylight, the darker the room the better.


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