What is the difference between E17 and ED17 bulbs?
E17 is the base size (intermediate), a little smaller than the standard E26. ED17 is the shape of the bulb. This bulb is a medium base (E26).
What is ED17 base?
Philips. Light Bulb Base Code: E26.
What is the difference between metal halide and high pressure sodium?
What is the Difference Between Metal Halide and High Pressure Sodium? Both Metal Halide and High Pressure Sodium bulbs are part of the HID family of bulbs. The primary visual difference between them is that metal halide light is white and the light emitted from a High Pressure Sodium bulb is amber orange.
What’s the difference between mercury vapor and metal halide?
Mercury Vapor (MV) lamps are most frequently used outside for parking and security lighting. Metal Halide (MH) lamps provide the best color rendering of all HID lamps; color rendition is almost as full spectrum incandescents.
What is an ED 17 bulb?
The ED17 Metal Halide lamp is a compact light that provides a bright and powerful output for its size.
What is better for veg MH or HPS?
MH grow lights (metal halide) are suited best for vegetative growth and HPS grow lights are superior for flowering.
Is metal halide the same as LED?
Metal halide bulbs contain metals that are evaporated into inert gas within the glass casing while LEDs are a solid state semiconductor technology. Both technologies produce a very high quality light. LEDs tend to last much longer and are a more energy efficient and less maintenance intensive technology.
Do mercury vapor lamps need a ballast?
As with fluorescent lights, mercury vapor lamps require a ballast to supply the proper voltage and regulate the current to the electrodes. The ballast is designed to be used with a specific size, or wattage, of bulb. Using too small of a ballast will result in lower light output and can shorten the life of the bulb.
Can E26 fit into E27?
These two standards are interchangeable, meaning a US E26 will fit in a European E27 base, and E27 will fit in a E26 base. The only difference is the voltage (for light bulbs). In fact there is only 1 mm difference between the threads of E26 and E27, so they are virtually identical.
How many B-17s were made?
A total of 512 were built — possibly from the July 1940-dated order from the then-USAAC for B-17s being for that specific number of airframes — making the B-17E the first mass-produced version of the B-17. One of these was later converted to the XB-38 Flying Fortress.
Did the B-17 have a turret?
^ Most sources say that the turret was introduced on the B-17F-75-DL, but photographs indicate that the F-70-DL also had the turret. ^ Hess & Winchester Wings of Fame No. 6, 1997, p. 41. ^ Bowers 1989, pp. 291–292. ^ Hess & Winchester Wings of Fame No. 6, 1997, pp. 41–42. ^ Caidin, Martin (1968). Flying Forts: The B-17 in World War II.
What does PB-1G mean on a B-17?
PB-1G: This designation was given to 17 B-17Gs used by U.S. Coast Guard as air-sea rescue aircraft. PB-1W: This designation was given to 31 B-17Gs used by the U.S. Navy as the first airborne early warning aircraft (AWACS). Wikimedia Commons has media related to Boeing B-17G.
Why did the B-17 have a tail gunner’s position?
Because experience had shown that the Flying Fortress would be vulnerable to attack from behind, both a tail gunner’s position and a powered, fully traversible dorsal turret behind the cockpit, (each armed with a pair of “light-barrel” Browning AN/M2 .50 cal. machine guns ), were added to the B-17E.