ARRL

Secure Site Login

Forum Home - Rules - Help - Login - Forgot Password
Members can access, post and reply to the forums below. Before you do, please first read the RULES.

Does "40 W" on HF equal the same "40 W" of a "40 W" lightbulb?

Jul 31st, 17:52

K6PAA

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
Is the “40 W” I use on my HF ham radio to reach the East Coast from California the same amount of power that a 40 W lightbulb uses?
Aug 1st, 09:09

W1VT

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
https://www.energy.gov/energysaver/save-electricity-and-fuel/lighting-choices-save-you-money/lumens-and-lighting-facts
These days a "40 W light bulb" put out around 450 lumens but the power used depends on the technology.
https://creebulb.com/40-watt-replacement-soft-white-tw-series
8.5 watts, 450 lumens high quality light but less efficient

https://creebulb.com/40-watt-replacement-soft-white?___store=default
5.5 watts 460 lumens or 84 lumens/watt

EcoSmart 40W Equivalent Soft White (2700K) Spiral CFL Light Bulb
9 watts 550 lumens or 61 lumens/watt
Aug 1st, 09:23

W1VT

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
https://en.wikipedia.org/wiki/Incandescent_light_bulb

40 W tungsten incandescent 1.9% efficiency 12.6 lumens/watt
Aug 1st, 09:37

W1VT

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
The power used by light bulbs is average power. These days, Part 97 defines power in terms of Peak Envelope Power or PEP.
(9) PEP (peak envelope power). The average power supplied to the antenna transmission line by a
transmitter during one RF cycle at the crest of the modulation envelope taken under normal operating
conditions.

DEC 2013 - QST (PG. 30)

How Much "Punch" Can You Get from Different Modes
(Feature)
Table 1
Average Power for
100 W PEP Transmitter
Average Compared
Mode Power (W) to CW (dB)
AM 25 –2.5
SSB 25 –2.5
FM 100 +3.6
RTTY 95 +3.3
CW 44 ref: 0
PSK31 75 +2.3
JT65 100 +3.5
Aug 5th, 12:29

K6PAA

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
Hi W1VT- Many thanks for your responses to my question!!
They are much appreciated!!
73, Peter A, K6PAA
Aug 5th, 12:30

K6PAA

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
PLUS-
TNX for the reference...

Back to Top