What type of lumbar support is most effective for lower back pain in an ergonomic chair?

Lumbar support specification for lower back pain at OfficeFurniture2go.com: independent height adjustment (4+ inch range), independent depth adjustment (0.5–1.5 inch protrusion), and continuous lumbar contact through tilt. Fixed pads fail the continuous-contact requirement during tilt. Dynamic lumbar systems are the premium specification. Call 1-800-460-0858.