BT-Shape Light Bulbs | McMaster-Carr

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	Bulb Shape Number Bulb Shape Number

BT28

BT37

BT56

	Wattage Wattage

	Base Type Base Type

	Screw In

	Bulb Shape Bulb Shape

	Blown Tubular

	Manufacturer Equivalent Model Number Manufacturer Equivalent Model Number

	Manufacturer Equivalent Manufacturer Equivalent

	For Ballast ANSI Number For Ballast ANSI Number

	Color Color

	Clear
	Frosted

	Screw-In Base Size Screw-In Base Size

	Mogul

	Light Technology Light Technology

Metal Halide

	Base Number Base Number

E39

EX39

	Voltage Voltage

	Brightness Brightness

10,000 to 19,999 lumens

20,000 to 29,999 lumens

30,000 to 99,999 lumens

100,000 lumens or greater

	Color Temperature Color Temperature

3,000 to 3,499 K

3,500 to 3,999 K

4,000 to 4,999 K

	Operating Position Operating Position

Horizontal

Base Up

Base Down

	For Ballast Type For Ballast Type

Electronic

Magnetic

	Rated Life @ 3 Hours per Day Rated Life @ 3 Hours per Day

	Metal Halide Enclosure Rating Metal Halide Enclosure Rating

Enclosed Fixtures

Open Fixtures

	Bulb Diameter Bulb Diameter

3 1/2"

4 5/8"

	Light Setting Light Setting

Dimmable

	Bulb Material Bulb Material

Glass

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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14 Products

About Brightness

About Light Appearance

Blown Tubular Bulb with E39 Base

Blown Tubular Bulb with EX39 Base

Mogul

Illuminate large warehouses, factories, and arenas with the bright, white light of these metal halide bulbs. Brightness is measured in lumens; the higher the lumens, the brighter the bulb. Color rendering index (CRI) is a measurement on a scale of 0-100 of how accurately the light from a bulb represents an object's true colors; the higher the number, the more natural the colors appear. Any CRI value over 80 will show colors true to life. A bulb’s estimated yearly cost is based on 3 hours of usage per day at $0.11 per kWh. They cannot be sold to Canada because they exceed local regulatory limits on mercury.

Bulbs with an EX39 base number will not burst when they fail.

Pulse-start bulbs restart nearly twice as fast as probe-start bulbs.

For Enclosed Fixtures
Wattage	Light Appearance	Brightness, lumens	Bulb Shape No.	Operating Position	CRI	For Ballast ANSI No.	Start Type	Bulb Material	Rated Life, hrs.	Est. Yearly Energy Cost, $	Bulb Dia.	O'all Lg.	Cannot Be Sold To		Each
Blown Tubular Bulb—E39 Mogul Base (1 5/8" Dia.)
750W	Neutral (4,000K)	78,000	BT37	Base Up	65	M149	Pulse	Glass	20,000	90.34	4 5/8"	11 1/2"	Canada	0000000	0000000
1,000W	Neutral (3,400K)	107,000	BT56	Base Up, Base Down, Horizontal	70	M47	Probe	Glass	18,000	120.45	7"	15 3/8"	Canada	0000000	00000
1,000W	Neutral (3,800K)	110,000	BT37	Base Up, Base Down, Horizontal	65	M47	Probe	Glass	15,000	120.45	4 5/8"	11 1/2"	Canada	0000000	00000
1,000W	Neutral (3,800K)	110,000	BT37	Base Up, Base Down, Horizontal	65	M141	Pulse	Glass	15,000	120.45	4 5/8"	11 1/2"	Canada	0000000	000000
1,000W	Neutral (4,000K)	110,000	BT56	Base Up, Base Down, Horizontal	65	M47	Probe	Glass	18,000	120.45	7"	15 3/8"	Canada	0000000	00000
1,500W	Neutral (4,000K)	170,000	BT56	Base Up	70	M48	Probe	Glass	3,000	180.68	7"	15 3/8"	Canada	0000000	000000
For Open Fixtures, Enclosed Fixtures
Blown Tubular Bulb—EX39 Mogul Base (1 5/8" Dia.)
175W	Neutral (4,000K)	14,400	BT28	Base Up	65	M57	Probe	Glass	10,000	21.08	3 1/2"	8 3/8"	Canada	0000000	00000
250W	Neutral (4,000K)	23,000	BT28	Base Up	65	M58	Probe	Glass	10,000	30.11	3 1/2"	8 3/8"	Canada	0000000	00000
400W	Neutral (3,400K)	38,500	BT37	Base Up	70	M59	Probe	Glass	20,000	48.18	4 5/8"	11 1/2"	Canada	0000000	00000
400W	Neutral (3,600K)	40,000	BT37	Base Up	65	M59	Probe	Glass	20,000	48.18	4 5/8"	11 1/2"	Canada	0000000	00000
1,000W	Neutral (3,200K)	102,000	BT56	Base Up	70	M47	Probe	Glass	15,000	120.45	7"	15 3/8"	Canada	0000000	000000
1,000W	Neutral (3,500K)	109,000	BT56	Base Up	65	M47	Probe	Glass	15,000	120.45	7"	15 3/8"	Canada	0000000	000000

Metal Halide Light Bulbs for High-Pressure Sodium Lights

Blown Tubular Bulb with E39 Base

Switch from the yellow light of high-pressure sodium to the white light of metal halide without changing ballasts. Brightness is measured in lumens; the higher the lumens, the brighter the bulb. Color rendering index (CRI) is a measurement on a scale of 0-100 of how accurately the light from a bulb represents an object's true colors; the higher the number, the more natural the colors appear. Any CRI value over 80 will show colors true to life. A bulb’s estimated yearly cost is based on 3 hours of usage per day at $0.11 per kWh. Bulbs cannot be sold to Canada because they exceed local regulatory limits on mercury content.

For Enclosed Fixtures
Wattage	Light Appearance	Brightness, lumens	Bulb Shape No.	Operating Position	CRI	For Ballast ANSI No.	Start Type	Bulb Material	Rated Life, hrs.	Est. Yearly Energy Cost, $	Bulb Dia.	O'all Lg.	Cannot Be Sold To		Each
Blown Tubular Bulb—E39 Mogul Base (1 5/8" Dia.)
750W	Neutral (4,000K)	72,000	BT37	Base Up, Base Down, Horizontal	65	S111	Probe	Glass	12,000	90.34	4 5/8"	11 1/2"	Canada	00000000	0000000
1,000W	Neutral (4,000K)	110,000	BT37	Base Up, Base Down	65	S52	Probe	Glass	15,000	120.45	4 5/8"	11 1/2"	Canada	00000000	000000