Artificial Light Burn on Moon Cactus: Acclimation Protocol

Diagnosis: Light/Heat Shock

Pale green central streaks on upper half of 3 stalks = photoinhibition from sudden intense light. New 400W metal halide at 12" caused tissue stress. Moving light to 24" was correct.

Acclimation Protocol

1. Hand test: if your hand feels heat at plant level → too close.
2. Gradually lower light over weeks as plant adapts.
3. Houseplant rule: light should feel warm, not hot, on skin.

Damage Prognosis

• Burned spots won't fully disappear.
• Goal: new unburned growth by spring.
• If plant declines → slow death; if stable → normal life with cosmetic scars.

Critical: Don't Remove Light

Darkness causes more shock. Follow gradual approach.

Watering Note

Boiled water, 400ml biweekly in 6" pot = likely overwatering. Let soil dry completely.

Additional: Stem Piercing

3 stalks piercing each other caused brown spots. Consider separating into 2 pots if distinct plants, or cut interfering stalk at base (not main stem), callous, re-root.