Jun 22, 2001 · In the lighting industry we referred to the "standard" household 110V. 60/75/100 watt bulb as an A19. The "A" represents roughly the pear shape of the envelope, and the 19 is the diameter of the envelope in 1/8ths of an inch. Added later: After checking, Chris M's "E" designation is also correct -as it defines the BASE of the bulb.

Nov 20, 2012 · Some LED bulb manufacturers will give you information on how to calculate for the In Rush Current the bulbs exhibit. I have some Lighting Science Group Definity 8.5 watt bulbs. When calculating the wattage for a dimmer. 80 Watts is used when adding up wattages for a …

Oct 27, 2007 · Informative. I need to remember m59 means pulse, and m155 means probe. Are these random denominations, or does m and the number stand for anything? ... Then there is e27 and e38, large envelope v. small. (I assume larger means it runs cooler.) Googling, so far, I see this bulb coming in frosted, clear, and shatter proof.

Oct 2, 2008 · I think that heatsinking in MR16's are comparable to GU10 and E27 based replacement bulbs that I have tested resently. When using >= 3 watt emitters, heatsinking in those bulbs just doesn't seem to work very well. Even if the heatsink is massive, like in this bulb:

Jan 27, 2006 · On the bulb it says E2C 70 watt. I had this floor lamp for many years and the bulb is not as bright anymore so I'm looking to find a replacement bulb for it. The ballast is a Maxlite SKE70D and list that the following can be used: E2C65 (1amp/68watt), F2D55/GRY10q-3 (0.92amp/58watt), and E2C40 HO (0.88amp/55watt).

Oct 27, 2015 · Hi Does anybody know of an LED which has two Elements built in, so that the Color can be changed seemless from warmwhite to coolwhite? I know that Philips has released a bulb which is switchable from warm to cool - but I need to change the lights color seemless. Thanks for all replys

Mar 5, 2014 · The lamp comes with a 12V, 20W halogen bulb. If I understand the math right, that means the power supply is providing about 1.67 amps of current. In fact, that might be too much current for most LEDs - at least for the ones useful in this application.

Oct 27, 2016 · on the website of osram, man can find lifespan data for each bulb, like for nightbreaker unlimited H4 bulb it is B3: 80 / 300 h, Tc: 160 / 500 h, first number is high beam, second number is low beam, so you know, 63.2% bulbs can live 500h on low beam, but by +130% philips H4, you only get a lifespan 450h, what is that based on, i find another ...

Jun 11, 2006 · I've never seen a bulb with an "RG" part number. I'd always thought that "PR" bulbs were designed for use with a (P)arabolic (R)eflector - probably a standardized distance from the flange to the filament, so that the reflector designer could put the filament at the focal point of the reflector (or at least a known distance from the focal point).

Jan 2, 2006 · When you apply more than 3 volts to it, it is then being overdriven. The added power will cause the filament to glow brighter and release more light, but at the expense of bulb life. Of course, too much overdrive will blow a bulb/led. I thought i'd chuck this in as Solstice did LED's but not incans.