The Real Cost of Your Lightning Source Order: A Checklist That's Saved Us Thousands

Here's the checklist. Use it before every Lightning Source submission.

I handle Lightning Source orders for our small publishing house. Over the past 7 years, I've personally made (and documented) 23 significant submission mistakes, totaling roughly $4,800 in wasted budget and countless hours of delay. Now I maintain our team's pre-flight checklist to prevent others from repeating my errors. If you only do one thing, make it this: verify your interior file's DPI and color mode before anything else. That single check has caught more potential disasters than any other.

Why You Should Listen to Me (And My Mistakes)

In my first year (2018), I made the classic "assumed my screen looked right" mistake. I submitted a 150-page interior PDF where the images looked fine on my monitor. The proof came back pixelated and blurry. 500 copies, $1,100, straight to recycling. That's when I learned that "looks fine" isn't a spec. After the third file rejection in Q1 2023 for color space issues, I finally built this systematic checklist. We've caught 47 potential errors using it in the past 18 months alone.

Most buyers focus on the cover design and trim size and completely miss the technical file specs that will get your submission rejected or result in a poor-quality print. The question everyone asks is "how long will it take?" The question they should ask first is "is my file actually print-ready?"

The Pre-Submission Checklist (The Nitty-Gritty)

1. Interior File: The Silent Killer

DPI/Resolution: Every single image and graphic must be 300 DPI at its final print size. Don't just trust your software's preview. Industry standard for commercial book printing is 300 DPI. A 3000 × 2000 pixel image at 300 DPI gives you a 10x6.67 inch maximum print area. If your image is smaller than that in your layout, you're likely under-res.

Color Mode: This isn't a suggestion. Your entire interior file must be in CMYK or Grayscale. I once ordered 300 author copies with RGB black text. It looked deep black on screen. The printed text was a washed-out, slightly purplish gray. We caught it on the proof, but it caused a 3-day delay. Lesson learned: convert all elements, especially black text, to CMYK (C:0 M:0 Y:0 K:100) or Grayscale.

Bleed & Safety Margin: If you have any full-page elements or backgrounds, you need at least 0.125" bleed. Your crucial text shouldn't come within 0.25" of the trim edge. I skipped the final review on a reprint because "it's basically the same as last time." The updated file had a footer 0.2" from the edge. 200 books, $400 mistake.

2. Cover File: Where Branding Goes to Die (If You're Not Careful)

Spine Width Calculation: This is math, not guesswork. The formula is (page count x paper bulk) + allowance. Get it wrong, and your title will be off-center or wrap onto the front/back. I don't have hard data on how often this happens, but based on our order history, my sense is it affects about 15% of first-time submissions. Lightning Source provides calculators—use them. Then add 0.5mm to your calculation for safety; paper bulk can vary slightly.

Color Matching (For Spot Colors): If you're using a specific Pantone color on your cover, understand it's an approximation in CMYK. Pantone colors may not have exact CMYK equivalents. For example, Pantone 286 C converts to roughly C:100 M:66 Y:0 K:2, but the printed result will vary. If color is absolutely brand-critical, you need to be prepared for a slight shift or consider a different print model.

3. Metadata & Setup: The Boring Stuff That Costs You Sales

BISAC Codes & Keywords: This isn't just admin. Inaccurate codes mean your book won't be discoverable by the right audience in Ingram's vast distribution network. Spend 20 minutes here. It's tempting to just pick the first code that seems close, but that ignores how booksellers and libraries actually categorize inventory.

Pricing & Discounts: Understand the wholesale discount you're offering. A too-high discount kills your royalty; a too-low discount makes retailers unlikely to stock it. This is a total cost of ownership (TCO) moment: the "cheapest" print cost means nothing if no one can profit from selling your book.

Boundary Conditions & When to Break the Rules

This checklist is built for standard trade books. There are exceptions.

Art Books & Photo Books: The 300 DPI rule is even more critical, and color fidelity is everything. You'll likely need to order a physical proof, not just rely on the digital one. The cost of that proof is part of your TCO, not an extra fee.

Simple Text-Only Novels: You can move faster. Your biggest risks are typographical errors and spine width. The color mode and DPI checks are still mandatory, but they're simpler to verify.

Rush Orders: The checklist is more important, not less. I knew I should get written confirmation on a rush timeline once, but thought "we've worked together for years." That was the one time the verbal agreement got forgotten. Saved 5 minutes of emailing, cost a 2-day delay on a launch event. The odds always catch up.

Take this with a grain of salt, but I think following a process like this can cut your submission errors by 80% or more. It's not about being perfect—it's about not wasting money on the same avoidable mistakes. Now go check your DPI.