Smartstart Is The Future - But Available Now. Will fit all Cloverleaf UV sterilisers: 24W, 36W, 48W, 72W, 144W. Cloverleaf 144W - you get 4 X 36W UV Bulbs. 144W = 4 x 36W UV Bulbs. CLoverleaf 72W - you get 2 X 36W Bulbs.
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