how many watts of cfls for seedling/veggitagive growth

i have 2 seedlings under a 20 watt fluro and i think they are stretchin to the light does that mean i need more lighting? and if i do how many more watts would you suggest?

come on guys i know you all know the answer to this it would realy help me hypethetical thinking

Double or triple it and move it closer to the plants man...