Re: Ship - Lamp Type Question...
Fosstech has it correct and I also recommend the BTL and BTN lamps over the others. There is other lamps available beyond these but those mentioned are the four main choices for this lamp.
BTN (dependant upon brand); 3,050°K to 3,200°K; 17,000 Lum to 17,600 Lumens; 500 hours in life. Some vary from
Base Down ±30°,
Base Down ±90° to any burning position. C-13D
filament that should be bi-plane and about 10x11mm in size. This is the normal
Halogen Medium
Pre-focus (P-28s/24) based 750w/120v lamp with a
LCL of 2.3/16" (lamp center length - from alignment fin to center of
filament).
BTP (dependant upon brand meaning that the specifications of one brand to another are not always the same much less one catalog to another catalog within a brand are not always the same.)
Halogen; 3,200°K uniformly between GE, Philips, Osram, Ushio and Wiko. 20,000 Lum to 21,000 Lumens in output, and 200 hours in life. (Same data on burn position or how much of an angle you are recommended to be using this lamp at. - don’t worry about the hang angle much - it can take it for show use just not for your work light use, just don’t hang them up side down or if possible at a over 90° angle.) C-13D
filament that should be bi-plane meaning staggered in being thicker in two rows deep and consolidating some in width by way of this about 11x14mm in size. A little larger in square MM length but in a
Fresnel it should not matter very much. This is the high output/shorter life version of the lamp. This would be useful for when you need a
bit more punch out of your
Fresnel such as say in a
top hat based down light
effect.
BTL (dependant upon brand): 2,950°K to 3,050°K; 11,000 Lumens; and 500 to 750 hours in life.
Base Down ±90° to any burn position. C-13D that should be bi-plane and measure 8.5x10mm to 11x11mm in size. This is the normal
Halogen Medium
Pre-focus (P-28s/24) based 500w/120v lamp with a
LCL of 2.3/16".
BTM (dependant upon brand)
Halogen; 3,200°K; 13,000 Lumens in output; 100 to 150 hours in life. Burn
Base Down ±90° in other words,
Base Down to Horizontal. C-13D that can be a bi-plane 12x11.5mm Monoplane
Grid Filament and probably also otherwise normally a bi-plane
filament in a similar size. (The
grid filament allows a more tightly packed
filament without it being three dimensional. Not all brands give this data so it cold be either of the
filament type, a number of
filament support styles and should be considered approximate in
filament size.) Again a larger
filament but much more output in exchange for a shorter lamp life. Also a more uniform and higher
color temperature that is standardized by need for a lamp that often will look good in a camera shoot.
