On Sun, 12 Jan 2003, Herbert Graf wrote:

*>Just wondering if anybody might have an idea as to how "weak" a UV light
*>source will still work for exposing pre-sensitized PCBs. I purchased a small
*>UV light (actually battery powered but easily adapted for mains power). It
*>has a UV bulb marked 'H-F4T5BLB(3)' First off, does the 3 mean "3 watts"? Is

Lamp codes go like ABCD (as in F4T5) and the meaning is:

Letter A:

F = fluorescent, i.e. has luminophores applied on or inside the envelope
(can be colored, f.ex. blacklight, which yours is. This NOT what you want
for boards and photoresist exposure)

G = germicidal/bare glass, uv transparent (this is what you want for
boards)

There are other letters. Imho do NOT light up a lamp with an unknown
letter and look into it. You could be looking into a hydrogen lamp. Very
bad for your eyes and skin.

First digit:

4 = 4 Watts.

Second letter and digit: base type

T5: four pins, two at each end, 5mm apart from each other

There are other bases available (f.ex. normal fluorescent lights have T20
at the end afair, for 20mm spaced pins).

You can fit a G4T5 lamp in your housing and then you can use it as you
intend. It will fit perfectly (the only difference is the emitter type, G
instead of F).

Peter

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