Receive the completed English ebook Let There Be Light by Tiago Souza in PDF, in light and dark reading editions, plus the companion Diagrams and Glossary PDFs. Digital files only; no printed copy or shipping. Delivery by email within 72 hours after confirmed payment and receipt of a valid email address, regardless of whether the campaign reaches its goal. If delivery fails, contact the organizer through this campaign. The existing ebook is also available outside this campaign; your support helps its independent digital distribution.

The same English digital package as the US$5 reward: Let There Be Light in light and dark PDF reading editions, plus companion Diagrams and Glossary PDFs. The additional US$5 is voluntary support for independent digital distribution and author work; it does not buy extra or exclusive content. Digital delivery by email within 72 hours after confirmed payment and receipt of a valid email address, regardless of the funding goal. No printed copy or shipping. Contact the organizer through this campaign if delivery fails.