what does par38 mean

Comparing PAR / BR / MR light bulbs
R20 and PAR20 lightbulbs Philips LED 541136 Color Changing PAR38 R20 and PAR20 lightbulbs LED 100W PAR38 Flood Dimmable Warm White Comparing PAR / BR / MR light bulbs Sylvania RefLED Retro PAR38 Dimmable Parabolic aluminized reflector - Wikipedia PAR38 LED Bulbs, Motion Activated | LED PAR38 LED Bulbs - Manufacturer Sengled Smart LED w/ Motion Sensor LED Star PAR38, RL-PAR38 120 DIM 12,5W PAR38 LED Bulbs, Motion Activated, Dusk 13.5W Green 40° PAR38 LED Bulb PAR38 LED Bulb vs BR40 LED Bulb Renesola PAR 38 LED Lamp - 16W, 16 W Philips 90-Watt PAR38 Halogen Indoor Halogen PAR38 80W Flood Light Bulb Philips MasterColor® Integrated 25W PAR 38 Ring PAR38 Smart LED Bulb (White BR30 LEDs / BR40 LEDs: How and When to Watt Equivalent PAR38 Medium E26 Base How to Identify Your Reflector Bulb PAR38 E27 15W LED Bulb (IP65) - LEDKIA Degree 3000K PAR38 LED Bulb GE LED+ Linkable Motion PAR38 Flood 25W LED PAR38 Spot / Flood Light 45 Watt PAR38 Halogen Light Bulb DIMMER COMPATIBILITY PAR20 + PAR30 + PAR 30 and BR 30 Bulb GE Lighting PAR38 LED Grow Light for Low Voltage Par 38 Enshine Par38 LED Flood Light Bulb, 18W 12PAR38/LED/840/F25/DIM/ULW/120V Led Parathom 120 13W 827 PAR38 30° E27 PAR 30 and BR 30 Bulb

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