Welders shade 3 and 5 refer to the dark green lens that welders use for oxyacetylene welding and cutting. However, if you are doing oxyacetylene welding then shade 5 is recommended.
For boro, many use a didy shield/glasses plus a welders shade 3 or 5. The overall idea to to filter out the sodium flare with with didy and the IR/UV with the welder's green filters.
Also use as Tom suggested two 100 watt CFL bulbs that take about 24 watts each. They come in daylight or incandescent. It takes a little getting used to the daylight CFL as the flame does appear a bit different under different color temperature lighting conditions.
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