what does par30 mean on a light bulb

R20 and PAR20 lightbulbs
PAR30 LED Light Bulb - LED Spotlight Sunco Lighting 6 Pack PAR30 LED Light 75 watt Equivalent PAR30 LED Light Bulb Sunlite 75-Watt Equivalent PAR30 Short Westinghouse Lighting 10 Watt (75 Watt PAR30 LED Bulb, Dusk to Dawn — Sunco Viribright PAR30 LED Bulb, 9W\u003d75W, Non Viribright 9W PAR30 LED Bulb Light, 75W Comparing PAR / BR / MR light bulbs Ecosmart 75-Watt Equivalent Par30 PAR30 LED Light Bulbs Dimmable (Short Sunco Lighting 4 Pack PAR30 LED Bulb PAR30 LED Reflector Light Bulbs Sylvania Renaissance PAR30 900 Lm LED PAR30 LED Dimmable Bulb | LED Spot PAR 30 and BR 30 Bulb 80946-SU | PAR30/LED/10W/S/FL35 TORCHSTAR 75 Watt Equivalent, PAR30 LED How to choose a BR30 LED lamp GE Reveal 75-Watt EQ LED Par30 Longneck Westinghouse Lighting 10 Watt (75 Watt Luxrite PAR30 LED Dimmable Bulb, 75W PAR30 LED Light Bulbs Dimmable (Short Energy Smart PAR30 Dimmable Flood Light Hyperikon 75 Watt Equivalent, PAR30 LED Sylvania Renaissance PAR30 900 Lm LED PAR30 LED Bulb, Dusk to Dawn — Sunco Shop Luxrite PAR30 LED Dimmable Bulb TriGlow 75-Watt Equivalent PAR30 GE Relax 75-Watt EQ LED Par30 Longneck TORCHSTAR 75 Watt Equivalent, PAR30 LED 80033-SU | PAR30/LED/3W Sunlite LED PAR30 Reflector HE Series SUNLITE 88053-SU LED PAR30 Reflector Light Bulb Base Types: Screw Bases

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