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CFL Spiral T4 & T5

High-output T4 and T5 spirals at 40W and 65W, up to 4,000 lumens, 4100K cool white. Where a standard spiral will not cover the space.
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CFL T4 & T5 High-Output Spiral Bulbs

High-output spiral compact fluorescent in T4 at 40W and T5 at 65W, delivering up to 4,000 lumens at 4100K cool white — equivalent to 150W and 300W incandescent.

These are the large-envelope spirals used where a single lamp has to light a whole space: garages, workshops, high ceilings and utility areas. Output and physical size are both stated, since a lamp this size will not clear most domestic shades.

A small but useful line for the trade shopper. LED equivalents at this output sit in LED specialty; standard-size spirals are in CFL spiral T2.