The Cloverleaf Smart Start replacement UV bulbs are available from Discount Leisure Products with fast shipping at competitive prices.
This 36 watt UV bulb will fit the 36 watt model of Smart Start UV and the 72 & 144W watt model, however you will require 2 x 36 watt UV bulbs for the 72W version & 4 x Bulbs for the 144W model