A 15% lift in simulated conversions in 10 minutes, without touching media spend.
This case study shows how Spectrum helped TamJai International optimize an upcoming student-focused marketing campaign, raising its simulated conversion rate from 55% to 63% through personalized copy for each customer profile.
On a typical HK$100,000 media spend (driving HK$167,000 in baseline sales at 1.67× ROAS), this lift could translate to around HK$25,000 in incremental revenue per campaign-making a big difference to marketing ROI.
Step-by-Step: How Spectrum Optimized TamJai's Ad
1. Upload the Creative
We took TamJai’s original ad-including headline, body copy, visuals, pricing, and call-to-action-and uploaded it directly into Spectrum. The entire process required no additional coding or tagging.
2. Create 100 Student Profiles
Spectrum randomly selected 100 Hong Kong university students and studied each of their digital footprints and publicly accessible data (Instagram bios, campus forum chatter, late-night order patterns).
3. Simulate Student Thought Processes
We used our Hong Kong-specific AI model (Dlab-852-Mini) to allow each digital twin to independently "think through" the TamJai marketing message. Each student profile assessed the message line-by-line based on their own background and context, assigning it:
- A sentiment score (0–100)
- Likelihood to take action (click, share, order)
- Specific qualitative feedback to highlight strengths and weaknesses
4. One-Pass Personalization & Optimization
Initial simulation results showed a baseline conversion rate of 55%. However, feedback revealed three main friction points: (1) message complexity, (2) overwhelming details, and (3) lack of clarity. Students preferred simpler, clearer messages but still enjoyed the playful use of local slang.
Based on this feedback, Spectrum personalized the marketing copy for each student profile, rewriting the hook and simplifying content while maintaining an appealing local tone. In just one pass, Spectrum produced 100 personalized copy variations-tailored specifically to each student's preferences and behaviors.
The Results: Immediate Conversion Lift
After Spectrum's optimization, the marketing copy achieved a simulated conversion rate of 63%, delivering an 8 percentage-point increase (≈15% relative lift) within 10 minutes.
- Before (original): 55% simulated conversion
- After (optimized): 63% simulated conversion
- Incremental revenue: Approximately HK$25,000 (15% of HK$167,000 baseline sales at 1.67× ROAS)
Before vs After (Example)
Before:
Let TamJai Jiejie guide you through authentic flavors – but who needs complicated steps? Our Hong Kong-Style Curry Soup Noodles blend a dozen spices into three simple toppings. No fuss, just pure Cantonese food comfort! 今日譚仔姐姐同你講專業食法，但太多細節容易亂--「港式咖喱湯米線」，十幾種香料，三款配料，簡單易明就忘記晒！...
After (Hobby-level personalized example):
Late-night drama binge with dinner? Skip the decision fatigue! TamJai’s Curry Soup Noodles reinvent convenience: 12-spice magic, 3 essential toppings, customizable heat. Your perfect local-food companion for screen time!... 鍾意夜晚食飯煲劇但係怕揀野食太麻煩？譚仔「港式咖喱湯米線」專為你設計：十幾種香料，簡單三款配料，辣度自選，追劇之餘輕鬆歎地道新滋味！...
Why Marketers Choose Spectrum
TamJai previously struggled with personalization due to limited customer data, resulting in generic campaigns targeting a single “average student” persona. By leveraging publicly accessible digital footprints, Spectrum made it possible to generate personalized messaging at scale, directly addressing customers' individual preferences and objections.
In deeper, more sophisticated runs, Spectrum’s simulations predict that personalization can drive conversion rates even higher, up to approximately 68%, making the ad potentially one of the best-performing campaigns in Asia.
Curious how much Spectrum could boost your next campaign?
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Disclaimer: This was an independent study using publicly available TamJai creative assets; TamJai International was not an official partner or client.