| ANSI Code | S51 |
| Bulb Base Type | Mogul Screw (E39) |
| Bulb Beam Angle | 360 Degrees |
| Bulb Dia. | 2 1/4 in |
| Bulb Finish | Clear |
| Bulb Manufacturers Warranty Length | 3 yr |
| Bulb Minimum Starting Temperature | -40 Degrees F |
| Bulb Operating Position | Universal Burning |
| Bulb Operating Temp. Range | -40 Degrees to 250 Degrees F |
| Bulb Shape | ED18 |
| Bulb Type | Standard |
| Bulb UL Type | No UL Type |
| Colour Rendering Index | In Stock |
| Colour Temperature | 2,100 K |
| Environmental Claim | None |
| For Enclosed Fixtures | Yes |
| Indoor/Outdoor Usage | Indoor/Outdoor |
| Item | High Pressure Sodium HID Bulb |
| Light Appearance | 1,000 to 2,699 K, Very Warm White |
| Light Distribution | Omnidirectional |
| Light Technology | High Pressure Sodium |
| Lumens | 50,000 lm |
| Overall Bulb Base Type | Mogul |
| Overall Bulb Shape | ED |
| Overall Length | 9 3/4 in |
| Rated Life | 24,000 hr |
| Shatter-Resistant | No |
| Standards | ANSI, TCLP Compliant |
| Trade Number | C400S51/ALTO |
| Wattage Equivalency | 400 W HPS |
| Watts | 400 W |