Philips's lamp needs four bulbs. This ceiling flush light is first and foremost intended for indoor use and you should not use bulbs with more than 18W.
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LED Bulbs
Philips Ledinaire 38W 600x600mm Integrated LED Ceiling Panel - Cool White - 108216863
Big on Electricals
Philips Ledinaire 38W 600x600mm Integrated LED Ceiling Panel - Cool White - 108216863