LED Strip Spacing Calculation for Lightboxes

Frequently Asked Questions

Q: How do I choose the right solution for my project?
Start by defining your budget, installation environment (indoor vs outdoor), and how long you expect the display to last. If you are unsure, send us your drawings and dimensions, and our engineers will recommend the best option within 24 hours.

Q: What is the minimum order quantity?
Standard items have no MOQ. Custom colors, custom sizes, and private label packaging usually require 500–1000 pieces depending on the product. Sample orders are always welcome before bulk production.

Q: How long is the lead time?
Standard stock items ship within 3–5 working days. Custom production takes 15–25 days depending on quantity and tooling. We can also rush orders for urgent trade shows if needed.

Q: Do you ship worldwide?
Yes. We export to 40+ countries including the USA, Germany, UK, Australia, and the Middle East. We can ship by sea (FCL/LCL), air, or express courier. We handle export documentation, customs declaration, and commercial invoice preparation.

Practical Tips Before You Order

Before placing an order, always confirm three things: first, double-check your exact dimensions and corner angles against your space. Second, ask for a physical sample before mass production—what looks good on screen may feel different in person. Third, plan for spare parts (LED strips, drivers, edge strips) at the same time as your main order, because reordering small spare parts later usually costs more than the parts themselves.

For long-term projects, we recommend keeping a detailed spec sheet for every installation: what size frame, what color strip, what LED color temperature, and which driver version. This makes future replacements and maintenance much faster. EEYUN has been manufacturing SEG lightboxes, aluminum profiles, and LED strips in Hangzhou, China since 2010, and we support OEM/ODM for distributors and brand owners worldwide.

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One of the most common complaints about a backlit fabric lightbox is visible LED dots (hotspots) or dark vertical bands between strips. Both problems come from incorrect LED-to-LED spacing. Here is the rule we use in our factory.

The Basic Formula

The general rule is: distance between LED strips = 2× box depth.

• Shallow box (100mm deep) → LED strips every 200mm
• Medium box (150mm deep) → LED strips every 300mm
• Deep box (200mm deep) → LED strips every 400mm

This works because light from each LED spreads in a cone. The deeper the box, the wider the cone at the fabric surface, so you can space strips farther apart without visible lines.

Why Not Just Add More LEDs?

Overcrowding LEDs is just as bad as under-spacing. More LEDs mean higher power draw, more heat, and more cost—but the image does not get brighter. Once the fabric surface hits about 800–1000 nits, the human eye cannot distinguish further brightness. Over-lighting also makes hotspots worse because each LED is brighter than needed.

LED Density (LEDs per Meter)

Within each strip, LED pitch matters too:

• 2835 SMD, 120 LEDs/m: Standard for most lightboxes.
• 3030 SMD, 60 LEDs/m: Brighter, for deeper boxes or low-translucency fabric.
• 5050 SMD: Rarely used in lightboxes; too wide and creates uneven light.

Power Supply Sizing

Always size the power supply at 80% capacity. If your LED strips total 200W, use a 250W driver. Running a driver at 100% load shortens its lifespan and causes voltage drop. For runs longer than 5 meters, inject power from both ends to avoid dimming at the middle.

Quick Checklist Before You Order

• Measure box depth → multiply by 2 → that is your strip gap.
• Count total watts → divide by 0.8 → minimum driver wattage.
• Keep strip runs under 5 meters on 24V; use parallel injection if longer.
• Test with a fabric sample before mass production.