These flash heads typically take 100W incandescent bulbs, but it's easy enough to retrofit them with dimmable LED bulbs instead, reducing power consumption and heat around the fragile flash tube. Because these bulbs are typically a bit larger than traditional ones, the original transport cover does not fit them. This is a larger cover to accommodate the larger bulb. Recommended bulbs on Amazon 🇺🇸 http://amzn.to/2fVsBpW Source files https://cad.onshape.com/documents/16d7a466b86bb4377ed771ab/w/34f6619d6716895c97cb2036/e/a1706da36216b716b7786e19