UVB lamps allow reptiles to synthesize vitamin D3, essential for calcium metabolism. This lamp (5.0 rating) is suitable for tropical species, and 10.0 for desert species. UVB radiation is filtered by the glass, so it's important to position the lamp correctly. The wattage helps determine the appropriate coverage area. Even though the lamps are low-profile, it's recommended to use them in an E27 ceramic socket. With regular use of 10 to 12 hours per day, it's advisable to replace the lamp every 6 months.