Screw-based, integral self-ballasted compact fluorescent lamps can be excluded if they meet the voluntary guidelines for maximum mercury content published by NEMA. The guidelines are such that:

Lamps with input wattage of 0 ≤ 25 watts must have 4mg total mercury or lessLamps with input wattage of 25 ≤ 40 watts must have 5mg total mercury or less

If the manufacturer documentation confirms the mercury content is below these maximum mercury content values, than the lamps may be excluded.