Dimming
Warranty policy on the dimming of Venture Lighting International metal halide lamps:

SCOPE: Venture Lighting metal halide lamps can only be step or bi-level dimmed by switched reactance methods, including capacitance or inductance changes to the ballast. Line voltage and electronic dimming systems are not covered by this policy.

WARRANTY POLICY: Venture Lighting International, Inc. agrees to extend a limited one-year warranty on lamp life to lamps operated on dimmable control gear, provided the following conditions are met:

1) A lamp must never be started by a ballast operating in the dimmed operating mode.

2) During any lamp start (cold or hot restart), the ballast must meet all of the requirements for starting and sustaining a lamp described in ANSI document C78.13xx for that lamp.

3) The lamp must be allowed to warm up for at least 10 minutes after the lamp has started (20 minutes for lamp wattages greater than 450). Only then can dimming begin.

4) For system design purposes an ANSI reference lamp cannot be dimmed below 50% of the rated lamp wattage at:
a) 90% input voltage for CWA ballasts
b) 95% input voltage for lag ballasts.

5) Operating position requirements are
• Base up ±15°, only, for probe start or pulse start lamps designated as U, BU, HBU
• Vertical ±15°, only, for pulse start lamps designated as U, V
• Base down ±15°, only, for pulse start lamps designated as BD, HBD
• No Horizontal dimming.

6) The ballast input voltage must be kept within the accepted line voltage range for the ballast type (±10% for CWA ballasts and ± 5% for lag ballasts) at all times in dim and full power modes

7) The dimming device should not allow the ballast current crest factor to exceed 1.8.