High-pressure sodium lamps
have also been developed that can start on the mercury vapor ballasts using either an internal ignition aid, such as a glow bottle and resistor that generates a high voltage pulse in the ballast secondary winding, or by the use of a neon-argon penning mixture and starting antenna that together result in a suitably low breakdown voltage for lamps to reliably start (Richardson 1975).
Maintaining good color recognition from high-pressure sodium lamps
, Bullough says, can be achieved by using at least 3 footcandles of illumination.
If the council goes ahead and installs a new orange sodium lamp
, I believe my human rights will be infringed.
The new fixtures, which include T-5 fluorescent lamps, will replace high-pressure sodium lamp
fixtures that have been operating around the clock Reportedly more efficient, the T-5s consume about 20% less electricity and can be turned off automatically when not in use.
Motta reacted immediately, and by getting only six neighbors to sign a petition he got the local power company to install a fully shielded, high-pressure sodium lamp
But having necked the maximum permitted dose of said painkillers my shoulder was still throbbing like an over-charged sodium lamp
and it was back to A&E.
When asked to demonstrate comet hunting, I sat beside Minerva and began methodically sweeping the western sky, picking up several rich star fields, a Messier object, and a bright sodium lamp
You could easily replace them with one 35-watt, high-pressure sodium lamp
with a lumen rating of 2150.
Tenders are invited for Supply of Sodium lamp
on DGSandD rate.
Two tenders for the supply of (a) streets lighting projectors with 150 watt sodium lamp
, also (b) 10 to 80 Amp.
A cost for metal halide lamps is not available from Virginia Power, but a metal halide lamp is less efficient than a high pressure sodium lamp
Two tenders for the erection of (a) sodium lamp
with related accessories, also (b) supply of other public lighting requisites.
Even though the efficacy for a high pressure sodium lamp
is higher (140 lumens per watt compared to 110 lumens per watt for metal halide), the metal halide lamp is more efficient because it has a smaller arc tube so a higher percentage of the light is transferred onto the playing surface.