The preferred lightbulb for flashlight promotional items is an LED or SMD bulb. The advantages of these bulbs include their bright lumens, long life, light weight, and low price point. Both LED and SMD bulbs are small, with SMD bulbs being the smallest. SMD bulbs have a larger beam angle than an LED bulb, making them well suited for spotlighting, floodlighting, and general illumination. LED bulbs are directional (they have a smaller beam angle), making them ideal for reading. Choose bulk LED flashlights for reading in bed, signing the check at a candlelit dinner, and making out tiny-print labels of all sorts.